810872531 has 6 divisors (see below), whose sum is σ = 943259940. Its totient is φ = 695033556.

The previous prime is 810872527. The next prime is 810872551. The reversal of 810872531 is 135278018.

It is not a de Polignac number, because 810872531 - 2² = 810872527 is a prime.

It is a super-2 number, since 2×810872531² = 1315028523060691922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 810872491 and 810872500.

It is not an unprimeable number, because it can be changed into a prime (810872551) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8274161 + ... + 8274258.

It is an arithmetic number, because the mean of its divisors is an integer number (157209990).

Almost surely, 2^810872531 is an apocalyptic number.

810872531 is a deficient number, since it is larger than the sum of its proper divisors (132387409).

810872531 is a wasteful number, since it uses less digits than its factorization.

810872531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16548433 (or 16548426 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 810872531 is about 28475.8236228559. The cubic root of 810872531 is about 932.5043423766.

The spelling of 810872531 in words is "eight hundred ten million, eight hundred seventy-two thousand, five hundred thirty-one".