90240131 has 4 divisors (see below), whose sum is σ = 95548392. Its totient is φ = 84931872.

The previous prime is 90240113. The next prime is 90240133. The reversal of 90240131 is 13104209.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90240131 is a prime.

It is a super-2 number, since 2×90240131² = 16286562485794322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90240133) 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, 2654105 + ... + 2654138.

It is an arithmetic number, because the mean of its divisors is an integer number (23887098).

Almost surely, 2^90240131 is an apocalyptic number.

90240131 is a deficient number, since it is larger than the sum of its proper divisors (5308261).

90240131 is a wasteful number, since it uses less digits than its factorization.

90240131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5308260.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 90240131 is about 9499.4805647467. The cubic root of 90240131 is about 448.5386852270.

The spelling of 90240131 in words is "ninety million, two hundred forty thousand, one hundred thirty-one".