86992531 has 4 divisors (see below), whose sum is σ = 87495552. Its totient is φ = 86489512.

The previous prime is 86992517. The next prime is 86992561. The reversal of 86992531 is 13529968.

It is a happy number.

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 86992531 - 2²³ = 78603923 is a prime.

It is a super-2 number, since 2×86992531² = 15135400899571922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86992501) 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, 251251 + ... + 251596.

It is an arithmetic number, because the mean of its divisors is an integer number (21873888).

Almost surely, 2^86992531 is an apocalyptic number.

86992531 is a deficient number, since it is larger than the sum of its proper divisors (503021).

86992531 is a wasteful number, since it uses less digits than its factorization.

86992531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503020.

The product of its digits is 116640, while the sum is 43.

The square root of 86992531 is about 9326.9786640691. The cubic root of 86992531 is about 443.0920815403.

The spelling of 86992531 in words is "eighty-six million, nine hundred ninety-two thousand, five hundred thirty-one".