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921001013 = 4611997833
BaseRepresentation
bin110110111001010…
…101110000110101
32101012000200212122
4312321111300311
53341234013023
6231220125325
731552244102
oct6671256065
92335020778
10921001013
11432976769
12218536845
13118a6a61a
148a465aa9
1555cc92c8
hex36e55c35

921001013 has 4 divisors (see below), whose sum is σ = 922999308. Its totient is φ = 919002720.

The previous prime is 921001007. The next prime is 921001031. The reversal of 921001013 is 310100129.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 561784804 + 359216209 = 23702^2 + 18953^2 .

It is a cyclic number.

It is not a de Polignac number, because 921001013 - 218 = 920738869 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 921000982 and 921001000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921001043) 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 3 ways as a sum of consecutive naturals, for example, 998456 + ... + 999377.

It is an arithmetic number, because the mean of its divisors is an integer number (230749827).

Almost surely, 2921001013 is an apocalyptic number.

It is an amenable number.

921001013 is a deficient number, since it is larger than the sum of its proper divisors (1998295).

921001013 is a wasteful number, since it uses less digits than its factorization.

921001013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1998294.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 921001013 is about 30347.9985007249. The cubic root of 921001013 is about 972.9414425850.

The spelling of 921001013 in words is "nine hundred twenty-one million, one thousand, thirteen".

Divisors: 1 461 1997833 921001013