812305531 has 2 divisors, whose sum is σ = 812305532. Its totient is φ = 812305530.

The previous prime is 812305519. The next prime is 812305579. The reversal of 812305531 is 135503218.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 812305531 - 2¹⁵ = 812272763 is a prime.

It is a super-2 number, since 2×812305531² = 1319680551386383922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 812305531.

It is not a weakly prime, because it can be changed into another prime (812305231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406152765 + 406152766.

It is an arithmetic number, because the mean of its divisors is an integer number (406152766).

Almost surely, 2^812305531 is an apocalyptic number.

812305531 is a deficient number, since it is larger than the sum of its proper divisors (1).

812305531 is an equidigital number, since it uses as much as digits as its factorization.

812305531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 812305531 is about 28500.9742114195. The cubic root of 812305531 is about 933.0533363191.

Adding to 812305531 its reverse (135503218), we get a palindrome (947808749).

The spelling of 812305531 in words is "eight hundred twelve million, three hundred five thousand, five hundred thirty-one".