869645631 has 8 divisors (see below), whose sum is σ = 1186493440. Its totient is φ = 566280792.

The previous prime is 869645563. The next prime is 869645641. The reversal of 869645631 is 136546968.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 869645631 - 2¹⁹ = 869121343 is a prime.

It is a super-2 number, since 2×869645631² = 1512567047034776322, 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 (869645641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3370591 + ... + 3370848.

It is an arithmetic number, because the mean of its divisors is an integer number (148311680).

Almost surely, 2^869645631 is an apocalyptic number.

869645631 is a deficient number, since it is larger than the sum of its proper divisors (316847809).

869645631 is a wasteful number, since it uses less digits than its factorization.

869645631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6741485.

The product of its digits is 933120, while the sum is 48.

The square root of 869645631 is about 29489.7546785320. The cubic root of 869645631 is about 954.5106384226.

The spelling of 869645631 in words is "eight hundred sixty-nine million, six hundred forty-five thousand, six hundred thirty-one".