811930431 has 16 divisors (see below), whose sum is σ = 1175035904. Its totient is φ = 495712224.

The previous prime is 811930423. The next prime is 811930507. The reversal of 811930431 is 134039118.

811930431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 811930431 - 2³ = 811930423 is a prime.

It is a super-2 number, since 2×811930431² = 1318462049567691522, 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 (811930411) 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, 77011 + ... + 86916.

It is an arithmetic number, because the mean of its divisors is an integer number (73439744).

Almost surely, 2^811930431 is an apocalyptic number.

811930431 is a deficient number, since it is larger than the sum of its proper divisors (363105473).

811930431 is a wasteful number, since it uses less digits than its factorization.

811930431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164070.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 811930431 is about 28494.3929747591. The cubic root of 811930431 is about 932.9096948860.

Adding to 811930431 its reverse (134039118), we get a palindrome (945969549).

The spelling of 811930431 in words is "eight hundred eleven million, nine hundred thirty thousand, four hundred thirty-one".