90557057 has 2 divisors, whose sum is σ = 90557058. Its totient is φ = 90557056.

The previous prime is 90557041. The next prime is 90557063. The reversal of 90557057 is 75075509.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88529281 + 2027776 = 9409^2 + 1424^2 .

It is an emirp because it is prime and its reverse (75075509) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90557057 - 2⁴ = 90557041 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90557057.

It is not a weakly prime, because it can be changed into another prime (90557087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45278528 + 45278529.

It is an arithmetic number, because the mean of its divisors is an integer number (45278529).

Almost surely, 2^90557057 is an apocalyptic number.

It is an amenable number.

90557057 is a deficient number, since it is larger than the sum of its proper divisors (1).

90557057 is an equidigital number, since it uses as much as digits as its factorization.

90557057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55125, while the sum is 38.

The square root of 90557057 is about 9516.1471720439. The cubic root of 90557057 is about 449.0631654033.

The spelling of 90557057 in words is "ninety million, five hundred fifty-seven thousand, fifty-seven".