869661631 has 16 divisors (see below), whose sum is σ = 911278080. Its totient is φ = 828970560.

The previous prime is 869661607. The next prime is 869661677. The reversal of 869661631 is 136166968.

It is a cyclic number.

It is not a de Polignac number, because 869661631 - 2²¹ = 867564479 is a prime.

It is a super-2 number, since 2×869661631² = 1512622704867160322, 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 (869641631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1056286 + ... + 1057108.

It is an arithmetic number, because the mean of its divisors is an integer number (56954880).

Almost surely, 2^869661631 is an apocalyptic number.

869661631 is a deficient number, since it is larger than the sum of its proper divisors (41616449).

869661631 is a wasteful number, since it uses less digits than its factorization.

869661631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326.

The product of its digits is 279936, while the sum is 46.

The square root of 869661631 is about 29490.0259579404. The cubic root of 869661631 is about 954.5164921772.

The spelling of 869661631 in words is "eight hundred sixty-nine million, six hundred sixty-one thousand, six hundred thirty-one".