819957231 has 12 divisors (see below), whose sum is σ = 1184648608. Its totient is φ = 546515424.

The previous prime is 819957227. The next prime is 819957233. The reversal of 819957231 is 132759918.

It is not a de Polignac number, because 819957231 - 2² = 819957227 is a prime.

It is a super-2 number, since 2×819957231² = 1344659721338374722, 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 (819957233) 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, 52026 + ... + 65928.

Almost surely, 2^819957231 is an apocalyptic number.

819957231 is a deficient number, since it is larger than the sum of its proper divisors (364691377).

819957231 is a wasteful number, since it uses less digits than its factorization.

819957231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20462 (or 20459 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 819957231 is about 28634.8953376820. The cubic root of 819957231 is about 935.9738891193.

The spelling of 819957231 in words is "eight hundred nineteen million, nine hundred fifty-seven thousand, two hundred thirty-one".