86651631 has 12 divisors (see below), whose sum is σ = 136542120. Its totient is φ = 52516080.

The previous prime is 86651629. The next prime is 86651639. The reversal of 86651631 is 13615668.

It is a happy number.

It is not a de Polignac number, because 86651631 - 2¹ = 86651629 is a prime.

It is a super-2 number, since 2×86651631² = 15017010309920322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86651639) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 437536 + ... + 437733.

It is an arithmetic number, because the mean of its divisors is an integer number (11378510).

Almost surely, 2^86651631 is an apocalyptic number.

86651631 is a deficient number, since it is larger than the sum of its proper divisors (49890489).

86651631 is a wasteful number, since it uses less digits than its factorization.

86651631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875286 (or 875283 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 86651631 is about 9308.6857826441. The cubic root of 86651631 is about 442.5125381873.

It can be divided in two parts, 8665 and 1631, that added together give a triangular number (10296 = T₁₄₃).

The spelling of 86651631 in words is "eighty-six million, six hundred fifty-one thousand, six hundred thirty-one".