816123931 has 12 divisors (see below), whose sum is σ = 948818032. Its totient is φ = 687657744.

The previous prime is 816123877. The next prime is 816123943. The reversal of 816123931 is 139321618.

It is not a de Polignac number, because 816123931 - 2⁹ = 816123419 is a prime.

It is a super-2 number, since 2×816123931² = 1332116541501785522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (816123031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7621 + ... + 41113.

Almost surely, 2^816123931 is an apocalyptic number.

816123931 is a deficient number, since it is larger than the sum of its proper divisors (132694101).

816123931 is an equidigital number, since it uses as much as digits as its factorization.

816123931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33618 (or 33559 counting only the distinct ones).

The product of its digits is 7776, while the sum is 34.

The square root of 816123931 is about 28567.8828582028. The cubic root of 816123931 is about 934.5130509864.

The spelling of 816123931 in words is "eight hundred sixteen million, one hundred twenty-three thousand, nine hundred thirty-one".