90902131 has 2 divisors, whose sum is σ = 90902132. Its totient is φ = 90902130.

The previous prime is 90902113. The next prime is 90902177. The reversal of 90902131 is 13120909.

Together with previous prime (90902113) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (13120909) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90902131 - 2¹⁷ = 90771059 is a prime.

It is a super-2 number, since 2×90902131² = 16526394840682322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 90902096 and 90902105.

It is not a weakly prime, because it can be changed into another prime (90902191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45451065 + 45451066.

It is an arithmetic number, because the mean of its divisors is an integer number (45451066).

Almost surely, 2^90902131 is an apocalyptic number.

90902131 is a deficient number, since it is larger than the sum of its proper divisors (1).

90902131 is an equidigital number, since it uses as much as digits as its factorization.

90902131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 90902131 is about 9534.2609047582. The cubic root of 90902131 is about 449.6328379568.

The spelling of 90902131 in words is "ninety million, nine hundred two thousand, one hundred thirty-one".