86820631 has 4 divisors (see below), whose sum is σ = 86841664. Its totient is φ = 86799600.

The previous prime is 86820623. The next prime is 86820637. The reversal of 86820631 is 13602868.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 86820631 - 2³ = 86820623 is a prime.

It is a super-2 number, since 2×86820631² = 15075643934476322, 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 (86820637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2055 + ... + 13336.

It is an arithmetic number, because the mean of its divisors is an integer number (21710416).

Almost surely, 2^86820631 is an apocalyptic number.

86820631 is a deficient number, since it is larger than the sum of its proper divisors (21033).

86820631 is a wasteful number, since it uses less digits than its factorization.

86820631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21032.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 86820631 is about 9317.7589043718. The cubic root of 86820631 is about 442.8000344228.

The spelling of 86820631 in words is "eighty-six million, eight hundred twenty thousand, six hundred thirty-one".