90812131 has 8 divisors (see below), whose sum is σ = 92980224. Its totient is φ = 88653960.

The previous prime is 90812083. The next prime is 90812143. The reversal of 90812131 is 13121809.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90812131 - 2⁷ = 90812003 is a prime.

It is a super-2 number, since 2×90812131² = 16493686273522322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90812096 and 90812105.

It is not an unprimeable number, because it can be changed into a prime (90812531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18016 + ... + 22498.

It is an arithmetic number, because the mean of its divisors is an integer number (11622528).

Almost surely, 2^90812131 is an apocalyptic number.

90812131 is a deficient number, since it is larger than the sum of its proper divisors (2168093).

90812131 is a wasteful number, since it uses less digits than its factorization.

90812131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4961.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 90812131 is about 9529.5399154419. The cubic root of 90812131 is about 449.4843987602.

The spelling of 90812131 in words is "ninety million, eight hundred twelve thousand, one hundred thirty-one".