86992591 has 6 divisors (see below), whose sum is σ = 101195520. Its totient is φ = 74565036.

The previous prime is 86992589. The next prime is 86992597. The reversal of 86992591 is 19529968.

It is not a de Polignac number, because 86992591 - 2¹ = 86992589 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 1775359 = 86992591 / (8 + 6 + 9 + 9 + 2 + 5 + 9 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86992597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 887631 + ... + 887728.

It is an arithmetic number, because the mean of its divisors is an integer number (16865920).

Almost surely, 2^86992591 is an apocalyptic number.

86992591 is a deficient number, since it is larger than the sum of its proper divisors (14202929).

86992591 is a wasteful number, since it uses less digits than its factorization.

86992591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775373 (or 1775366 counting only the distinct ones).

The product of its digits is 349920, while the sum is 49.

The square root of 86992591 is about 9326.9818805442. The cubic root of 86992591 is about 443.0921834093.

The spelling of 86992591 in words is "eighty-six million, nine hundred ninety-two thousand, five hundred ninety-one".