86531615 has 8 divisors (see below), whose sum is σ = 109946160. Its totient is φ = 65153152.

The previous prime is 86531597. The next prime is 86531617. The reversal of 86531615 is 51613568.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86531615 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86531617) 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, 508925 + ... + 509094.

It is an arithmetic number, because the mean of its divisors is an integer number (13743270).

Almost surely, 2^86531615 is an apocalyptic number.

86531615 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

86531615 is a deficient number, since it is larger than the sum of its proper divisors (23414545).

86531615 is a wasteful number, since it uses less digits than its factorization.

86531615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018041.

The product of its digits is 21600, while the sum is 35.

The square root of 86531615 is about 9302.2370965268. The cubic root of 86531615 is about 442.3081445626.

The spelling of 86531615 in words is "eighty-six million, five hundred thirty-one thousand, six hundred fifteen".