86391321 has 16 divisors (see below), whose sum is σ = 117028800. Its totient is φ = 56680448.

The previous prime is 86391313. The next prime is 86391323. The reversal of 86391321 is 12319368.

It is a cyclic number.

It is not a de Polignac number, because 86391321 - 2³ = 86391313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (86391323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67990 + ... + 69248.

It is an arithmetic number, because the mean of its divisors is an integer number (7314300).

Almost surely, 2^86391321 is an apocalyptic number.

It is an amenable number.

86391321 is a deficient number, since it is larger than the sum of its proper divisors (30637479).

86391321 is a wasteful number, since it uses less digits than its factorization.

86391321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1608.

The product of its digits is 7776, while the sum is 33.

The square root of 86391321 is about 9294.6931633056. The cubic root of 86391321 is about 442.0689766979.

The spelling of 86391321 in words is "eighty-six million, three hundred ninety-one thousand, three hundred twenty-one".