90599831 has 4 divisors (see below), whose sum is σ = 103542672. Its totient is φ = 77656992.

The previous prime is 90599827. The next prime is 90599867. The reversal of 90599831 is 13899509.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13899509 = 13 ⋅1069193.

It is not a de Polignac number, because 90599831 - 2² = 90599827 is a prime.

It is a super-2 number, since 2×90599831² = 16416658754457122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90599891) 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, 6471410 + ... + 6471423.

It is an arithmetic number, because the mean of its divisors is an integer number (25885668).

Almost surely, 2^90599831 is an apocalyptic number.

90599831 is a deficient number, since it is larger than the sum of its proper divisors (12942841).

90599831 is a wasteful number, since it uses less digits than its factorization.

90599831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12942840.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 90599831 is about 9518.3943498891. The cubic root of 90599831 is about 449.1338582349.

The spelling of 90599831 in words is "ninety million, five hundred ninety-nine thousand, eight hundred thirty-one".