86611631 has 2 divisors, whose sum is σ = 86611632. Its totient is φ = 86611630.

The previous prime is 86611621. The next prime is 86611667. The reversal of 86611631 is 13611668.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 86611631 - 2²² = 82417327 is a prime.

It is a super-2 number, since 2×86611631² = 15003149248960322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86611601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43305815 + 43305816.

It is an arithmetic number, because the mean of its divisors is an integer number (43305816).

Almost surely, 2^86611631 is an apocalyptic number.

86611631 is a deficient number, since it is larger than the sum of its proper divisors (1).

86611631 is an equidigital number, since it uses as much as digits as its factorization.

86611631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 32.

The square root of 86611631 is about 9306.5370036335. The cubic root of 86611631 is about 442.4444370423. Note that the first 4 decimals are identical.

The spelling of 86611631 in words is "eighty-six million, six hundred eleven thousand, six hundred thirty-one".