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1213031 = 10311777
BaseRepresentation
bin100101000001001100111
32021121222002
410220021213
5302304111
641555515
713211351
oct4501147
92247862
101213031
11759406
124a5b9b
13336191
142380d1
1518e63b
hex128267

1213031 has 4 divisors (see below), whose sum is σ = 1224912. Its totient is φ = 1201152.

The previous prime is 1213027. The next prime is 1213033. The reversal of 1213031 is 1303121.

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

It is a cyclic number.

It is not a de Polignac number, because 1213031 - 22 = 1213027 is a prime.

It is a super-2 number, since 2×12130312 = 2942888413922, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5786 + ... + 5991.

It is an arithmetic number, because the mean of its divisors is an integer number (306228).

21213031 is an apocalyptic number.

1213031 is a deficient number, since it is larger than the sum of its proper divisors (11881).

1213031 is a wasteful number, since it uses less digits than its factorization.

1213031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11880.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 1213031 is about 1101.3768655642. The cubic root of 1213031 is about 106.6491258049.

Adding to 1213031 its reverse (1303121), we get a palindrome (2516152).

The spelling of 1213031 in words is "one million, two hundred thirteen thousand, thirty-one".

Divisors: 1 103 11777 1213031