90338531 has 2 divisors, whose sum is σ = 90338532. Its totient is φ = 90338530.

The previous prime is 90338513. The next prime is 90338627. The reversal of 90338531 is 13583309.

Together with previous prime (90338513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90338531 is a prime.

It is a super-2 number, since 2×90338531² = 16322100366475922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90338231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45169265 + 45169266.

It is an arithmetic number, because the mean of its divisors is an integer number (45169266).

Almost surely, 2^90338531 is an apocalyptic number.

90338531 is a deficient number, since it is larger than the sum of its proper divisors (1).

90338531 is an equidigital number, since it uses as much as digits as its factorization.

90338531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 90338531 is about 9504.6583841819. The cubic root of 90338531 is about 448.7016584461.

The spelling of 90338531 in words is "ninety million, three hundred thirty-eight thousand, five hundred thirty-one".