921233431 has 4 divisors (see below), whose sum is σ = 921667864. Its totient is φ = 920799000.

The previous prime is 921233399. The next prime is 921233441. The reversal of 921233431 is 134332129.

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 921233431 - 2⁵ = 921233399 is a prime.

It is a super-2 number, since 2×921233431² = 1697342068784063522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 921233431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921233441) 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, 214020 + ... + 218281.

It is an arithmetic number, because the mean of its divisors is an integer number (230416966).

Almost surely, 2^921233431 is an apocalyptic number.

921233431 is a deficient number, since it is larger than the sum of its proper divisors (434433).

921233431 is a wasteful number, since it uses less digits than its factorization.

921233431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434432.

The product of its digits is 3888, while the sum is 28.

The square root of 921233431 is about 30351.8274738112. The cubic root of 921233431 is about 973.0232774878.

The spelling of 921233431 in words is "nine hundred twenty-one million, two hundred thirty-three thousand, four hundred thirty-one".