90409157 has 2 divisors, whose sum is σ = 90409158. Its totient is φ = 90409156.

The previous prime is 90409133. The next prime is 90409169. The reversal of 90409157 is 75190409.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 81830116 + 8579041 = 9046^2 + 2929^2 .

It is a cyclic number.

It is not a de Polignac number, because 90409157 - 2²⁰ = 89360581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90409117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45204578 + 45204579.

It is an arithmetic number, because the mean of its divisors is an integer number (45204579).

Almost surely, 2^90409157 is an apocalyptic number.

It is an amenable number.

90409157 is a deficient number, since it is larger than the sum of its proper divisors (1).

90409157 is an equidigital number, since it uses as much as digits as its factorization.

90409157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 90409157 is about 9508.3729943666. The cubic root of 90409157 is about 448.8185585412.

The spelling of 90409157 in words is "ninety million, four hundred nine thousand, one hundred fifty-seven".