90757591 has 2 divisors, whose sum is σ = 90757592. Its totient is φ = 90757590.

The previous prime is 90757573. The next prime is 90757613. The reversal of 90757591 is 19575709.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90757591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90757561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45378795 + 45378796.

It is an arithmetic number, because the mean of its divisors is an integer number (45378796).

Almost surely, 2^90757591 is an apocalyptic number.

90757591 is a deficient number, since it is larger than the sum of its proper divisors (1).

90757591 is an equidigital number, since it uses as much as digits as its factorization.

90757591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 99225, while the sum is 43.

The square root of 90757591 is about 9526.6778574695. The cubic root of 90757591 is about 449.3943968768.

The spelling of 90757591 in words is "ninety million, seven hundred fifty-seven thousand, five hundred ninety-one".