921716231 has 16 divisors (see below), whose sum is σ = 949428480. Its totient is φ = 894499200.

The previous prime is 921716219. The next prime is 921716233. The reversal of 921716231 is 132617129.

It is a cyclic number.

It is not a de Polignac number, because 921716231 - 2¹⁴ = 921699847 is a prime.

It is a super-2 number, since 2×921716231² = 1699121620977690722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921716233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2734895 + ... + 2735231.

It is an arithmetic number, because the mean of its divisors is an integer number (59339280).

Almost surely, 2^921716231 is an apocalyptic number.

921716231 is a deficient number, since it is larger than the sum of its proper divisors (27712249).

921716231 is a wasteful number, since it uses less digits than its factorization.

921716231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854.

The product of its digits is 4536, while the sum is 32.

The square root of 921716231 is about 30359.7798246298. The cubic root of 921716231 is about 973.1932284759.

The spelling of 921716231 in words is "nine hundred twenty-one million, seven hundred sixteen thousand, two hundred thirty-one".