90508291 has 2 divisors, whose sum is σ = 90508292. Its totient is φ = 90508290.

The previous prime is 90508277. The next prime is 90508337. The reversal of 90508291 is 19280509.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90508291 - 2¹¹ = 90506243 is a prime.

It is not a weakly prime, because it can be changed into another prime (90508991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45254145 + 45254146.

It is an arithmetic number, because the mean of its divisors is an integer number (45254146).

Almost surely, 2^90508291 is an apocalyptic number.

90508291 is a deficient number, since it is larger than the sum of its proper divisors (1).

90508291 is an equidigital number, since it uses as much as digits as its factorization.

90508291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 90508291 is about 9513.5845505256. The cubic root of 90508291 is about 448.9825423972.

The spelling of 90508291 in words is "ninety million, five hundred eight thousand, two hundred ninety-one".