921257113 has 4 divisors (see below), whose sum is σ = 1052865280. Its totient is φ = 789648948.

The previous prime is 921257083. The next prime is 921257119. The reversal of 921257113 is 311752129.

921257113 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 921257113 - 2²⁵ = 887702681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (921257119) 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, 65804073 + ... + 65804086.

It is an arithmetic number, because the mean of its divisors is an integer number (263216320).

Almost surely, 2^921257113 is an apocalyptic number.

It is an amenable number.

921257113 is a deficient number, since it is larger than the sum of its proper divisors (131608167).

921257113 is a wasteful number, since it uses less digits than its factorization.

921257113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131608166.

The product of its digits is 3780, while the sum is 31.

The square root of 921257113 is about 30352.2175960835. The cubic root of 921257113 is about 973.0316152008.

The spelling of 921257113 in words is "nine hundred twenty-one million, two hundred fifty-seven thousand, one hundred thirteen".