86631915 has 32 divisors (see below), whose sum is σ = 153156096. Its totient is φ = 41592320.

The previous prime is 86631901. The next prime is 86631917. The reversal of 86631915 is 51913668.

It is not a de Polignac number, because 86631915 - 2⁴ = 86631899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (86631917) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1521 + ... + 13250.

It is an arithmetic number, because the mean of its divisors is an integer number (4786128).

Almost surely, 2^86631915 is an apocalyptic number.

86631915 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

86631915 is a deficient number, since it is larger than the sum of its proper divisors (66524181).

86631915 is a wasteful number, since it uses less digits than its factorization.

86631915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14819.

The product of its digits is 38880, while the sum is 39.

The square root of 86631915 is about 9307.6267114662. The cubic root of 86631915 is about 442.4789737527.

The spelling of 86631915 in words is "eighty-six million, six hundred thirty-one thousand, nine hundred fifteen".