900900557 has 2 divisors, whose sum is σ = 900900558. Its totient is φ = 900900556.

The previous prime is 900900527. The next prime is 900900563. The reversal of 900900557 is 755009009.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 831111241 + 69789316 = 28829^2 + 8354^2 .

It is a cyclic number.

It is not a de Polignac number, because 900900557 - 2²² = 896706253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (900900527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450450278 + 450450279.

It is an arithmetic number, because the mean of its divisors is an integer number (450450279).

Almost surely, 2^900900557 is an apocalyptic number.

It is an amenable number.

900900557 is a deficient number, since it is larger than the sum of its proper divisors (1).

900900557 is an equidigital number, since it uses as much as digits as its factorization.

900900557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14175, while the sum is 35.

The square root of 900900557 is about 30015.0055305675. The cubic root of 900900557 is about 965.8113062276.

The spelling of 900900557 in words is "nine hundred million, nine hundred thousand, five hundred fifty-seven".