491792931 has 64 divisors (see below), whose sum is σ = 858562560. Its totient is φ = 272432160.

The previous prime is 491792927. The next prime is 491792947. The reversal of 491792931 is 139297194.

491792931 is a `hidden beast` number, since 491 + 79 + 2 + 93 + 1 = 666.

It is not a de Polignac number, because 491792931 - 2² = 491792927 is a prime.

It is a super-2 number, since 2×491792931² = 483720573963141522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (491792911) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 898800 + ... + 899346.

It is an arithmetic number, because the mean of its divisors is an integer number (13415040).

Almost surely, 2^491792931 is an apocalyptic number.

491792931 is a deficient number, since it is larger than the sum of its proper divisors (366769629).

491792931 is a wasteful number, since it uses less digits than its factorization.

491792931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701 (or 695 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 491792931 is about 22176.4048258504. The cubic root of 491792931 is about 789.3339100485. Note that the first 3 decimals are identical.

The spelling of 491792931 in words is "four hundred ninety-one million, seven hundred ninety-two thousand, nine hundred thirty-one".