812869531 has 2 divisors, whose sum is σ = 812869532. Its totient is φ = 812869530.

The previous prime is 812869529. The next prime is 812869543. The reversal of 812869531 is 135968218.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 812869531 - 2¹ = 812869529 is a prime.

It is a super-2 number, since 2×812869531² = 1321513748856319922, which contains 22 as substring.

Together with 812869529, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (812869231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 406434765 + 406434766.

It is an arithmetic number, because the mean of its divisors is an integer number (406434766).

Almost surely, 2^812869531 is an apocalyptic number.

812869531 is a deficient number, since it is larger than the sum of its proper divisors (1).

812869531 is an equidigital number, since it uses as much as digits as its factorization.

812869531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 43.

The square root of 812869531 is about 28510.8668931690. The cubic root of 812869531 is about 933.2692322331.

The spelling of 812869531 in words is "eight hundred twelve million, eight hundred sixty-nine thousand, five hundred thirty-one".