90391157 has 2 divisors, whose sum is σ = 90391158. Its totient is φ = 90391156.

The previous prime is 90391153. The next prime is 90391177. The reversal of 90391157 is 75119309.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89226916 + 1164241 = 9446^2 + 1079^2 .

It is a cyclic number.

It is not a de Polignac number, because 90391157 - 2² = 90391153 is a prime.

It is a super-2 number, since 2×90391157² = 16341122527597298, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90391153) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45195578 + 45195579.

It is an arithmetic number, because the mean of its divisors is an integer number (45195579).

Almost surely, 2^90391157 is an apocalyptic number.

It is an amenable number.

90391157 is a deficient number, since it is larger than the sum of its proper divisors (1).

90391157 is an equidigital number, since it uses as much as digits as its factorization.

90391157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8505, while the sum is 35.

The square root of 90391157 is about 9507.4264130731. The cubic root of 90391157 is about 448.7887707390.

The spelling of 90391157 in words is "ninety million, three hundred ninety-one thousand, one hundred fifty-seven".