86789931 has 4 divisors (see below), whose sum is σ = 115719912. Its totient is φ = 57859952.

The previous prime is 86789921. The next prime is 86789951. The reversal of 86789931 is 13998768.

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

It is a cyclic number.

It is not a de Polignac number, because 86789931 - 2⁷ = 86789803 is a prime.

It is a super-2 number, since 2×86789931² = 15064984245969522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (86789921) 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, 14464986 + ... + 14464991.

It is an arithmetic number, because the mean of its divisors is an integer number (28929978).

Almost surely, 2^86789931 is an apocalyptic number.

86789931 is a deficient number, since it is larger than the sum of its proper divisors (28929981).

86789931 is a wasteful number, since it uses less digits than its factorization.

86789931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28929980.

The product of its digits is 653184, while the sum is 51.

The square root of 86789931 is about 9316.1113668741. Note that the first 3 decimals coincide. The cubic root of 86789931 is about 442.7478365235.

The spelling of 86789931 in words is "eighty-six million, seven hundred eighty-nine thousand, nine hundred thirty-one".