921257136 has 60 divisors (see below), whose sum is σ = 2620531680. Its totient is φ = 302048640.

The previous prime is 921257131. The next prime is 921257137. The reversal of 921257136 is 631752129.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 921257136.

It is not an unprimeable number, because it can be changed into a prime (921257131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43656 + ... + 61223.

It is an arithmetic number, because the mean of its divisors is an integer number (43675528).

Almost surely, 2^921257136 is an apocalyptic number.

It is an amenable number.

921257136 is an abundant number, since it is smaller than the sum of its proper divisors (1699274544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

921257136 is a wasteful number, since it uses less digits than its factorization.

921257136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104954 (or 104945 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 921257136 is about 30352.2179749685. The cubic root of 921257136 is about 973.0316232984.

The spelling of 921257136 in words is "nine hundred twenty-one million, two hundred fifty-seven thousand, one hundred thirty-six".