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1210957031 = 29269155231
BaseRepresentation
bin100100000101101…
…1011110011100111
310010101121222202102
41020023123303213
54440001111111
6320055002315
742002651654
oct11013336347
93111558672
101210957031
1157160aa39
1229966939b
13163b5c82b
14b6b82c2b
15714a213b
hex482dbce7

1210957031 has 8 divisors (see below), whose sum is σ = 1257379200. Its totient is φ = 1164845920.

The previous prime is 1210957009. The next prime is 1210957049. The reversal of 1210957031 is 1307590121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1210957031 - 218 = 1210694887 is a prime.

It is a super-2 number, since 2×12109570312 = 2932833861856669922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a zygodrome in base 5.

It is a junction number, because it is equal to n+sod(n) for n = 1210956985 and 1210957003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210957081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69815 + ... + 85416.

It is an arithmetic number, because the mean of its divisors is an integer number (157172400).

Almost surely, 21210957031 is an apocalyptic number.

1210957031 is the 15563-rd centered decagonal number.

1210957031 is a deficient number, since it is larger than the sum of its proper divisors (46422169).

1210957031 is a wasteful number, since it uses less digits than its factorization.

1210957031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155529.

The product of its (nonzero) digits is 1890, while the sum is 29.

The square root of 1210957031 is about 34798.8078962484. The cubic root of 1210957031 is about 1065.8831033296.

The spelling of 1210957031 in words is "one billion, two hundred ten million, nine hundred fifty-seven thousand, thirty-one".

Divisors: 1 29 269 7801 155231 4501699 41757139 1210957031