90131 has 4 divisors (see below), whose sum is σ = 90792. Its totient is φ = 89472.

The previous prime is 90127. The next prime is 90149. The reversal of 90131 is 13109.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 90131 - 2² = 90127 is a prime.

It is a super-2 number, since 2×90131² = 16247194322, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (90121) 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, 41 + ... + 426.

It is an arithmetic number, because the mean of its divisors is an integer number (22698).

2⁹⁰¹³¹ is an apocalyptic number.

90131 is a deficient number, since it is larger than the sum of its proper divisors (661).

90131 is a wasteful number, since it uses less digits than its factorization.

90131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660.

The product of its (nonzero) digits is 27, while the sum is 14.

The square root of 90131 is about 300.2182539420. The cubic root of 90131 is about 44.8357800366.

The spelling of 90131 in words is "ninety thousand, one hundred thirty-one".