869523931 has 2 divisors, whose sum is σ = 869523932. Its totient is φ = 869523930.

The previous prime is 869523881. The next prime is 869523937. The reversal of 869523931 is 139325968.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 869523931 - 2¹³ = 869515739 is a prime.

It is a super-2 number, since 2×869523931² = 1512143733163385522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (869523937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434761965 + 434761966.

It is an arithmetic number, because the mean of its divisors is an integer number (434761966).

Almost surely, 2^869523931 is an apocalyptic number.

869523931 is a deficient number, since it is larger than the sum of its proper divisors (1).

869523931 is an equidigital number, since it uses as much as digits as its factorization.

869523931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 46.

The square root of 869523931 is about 29487.6911778457. The cubic root of 869523931 is about 954.4661109508.

It can be divided in two parts, 869 and 523931, that added together give a triangular number (524800 = T₁₀₂₄).

The spelling of 869523931 in words is "eight hundred sixty-nine million, five hundred twenty-three thousand, nine hundred thirty-one".