86456991 has 4 divisors (see below), whose sum is σ = 115275992. Its totient is φ = 57637992.

The previous prime is 86456969. The next prime is 86456999. The reversal of 86456991 is 19965468.

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

It is not a de Polignac number, because 86456991 - 2⁵ = 86456959 is a prime.

It is a super-2 number, since 2×86456991² = 14949622585548162, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 86456991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86456999) 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, 14409496 + ... + 14409501.

It is an arithmetic number, because the mean of its divisors is an integer number (28818998).

Almost surely, 2^86456991 is an apocalyptic number.

86456991 is a deficient number, since it is larger than the sum of its proper divisors (28819001).

86456991 is a wasteful number, since it uses less digits than its factorization.

86456991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28819000.

The product of its digits is 466560, while the sum is 48.

The square root of 86456991 is about 9298.2251532214. The cubic root of 86456991 is about 442.1809606203.

The spelling of 86456991 in words is "eighty-six million, four hundred fifty-six thousand, nine hundred ninety-one".