86590921 has 6 divisors (see below), whose sum is σ = 87798750. Its totient is φ = 85399488.

The previous prime is 86590919. The next prime is 86590939. The reversal of 86590921 is 12909568.

It can be written as a sum of positive squares in 3 ways, for example, as 20575296 + 66015625 = 4536^2 + 8125^2 .

It is not a de Polignac number, because 86590921 - 2¹ = 86590919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86590901) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2796 + ... + 13453.

It is an arithmetic number, because the mean of its divisors is an integer number (14633125).

Almost surely, 2^86590921 is an apocalyptic number.

It is an amenable number.

86590921 is a deficient number, since it is larger than the sum of its proper divisors (1207829).

86590921 is an equidigital number, since it uses as much as digits as its factorization.

86590921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16395 (or 16322 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 86590921 is about 9305.4242783443. The cubic root of 86590921 is about 442.4091694360.

The spelling of 86590921 in words is "eighty-six million, five hundred ninety thousand, nine hundred twenty-one".