90233131 has 2 divisors, whose sum is σ = 90233132. Its totient is φ = 90233130.

The previous prime is 90233113. The next prime is 90233137. The reversal of 90233131 is 13133209.

Together with previous prime (90233113) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (13133209) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90233131 - 2¹⁷ = 90102059 is a prime.

It is a super-2 number, since 2×90233131² = 16284035860126322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90233137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45116565 + 45116566.

It is an arithmetic number, because the mean of its divisors is an integer number (45116566).

Almost surely, 2^90233131 is an apocalyptic number.

90233131 is a deficient number, since it is larger than the sum of its proper divisors (1).

90233131 is an equidigital number, since it uses as much as digits as its factorization.

90233131 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 22.

The square root of 90233131 is about 9499.1121164033. The cubic root of 90233131 is about 448.5270870908.

The spelling of 90233131 in words is "ninety million, two hundred thirty-three thousand, one hundred thirty-one".