990505057 has 2 divisors, whose sum is σ = 990505058. Its totient is φ = 990505056.

The previous prime is 990505037. The next prime is 990505123. The reversal of 990505057 is 750505099.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 804346321 + 186158736 = 28361^2 + 13644^2 .

It is a cyclic number.

It is not a de Polignac number, because 990505057 - 2⁷ = 990504929 is a prime.

It is a super-2 number, since 2×990505057² = 1962200535885146498, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (990505027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495252528 + 495252529.

It is an arithmetic number, because the mean of its divisors is an integer number (495252529).

Almost surely, 2^990505057 is an apocalyptic number.

It is an amenable number.

990505057 is a deficient number, since it is larger than the sum of its proper divisors (1).

990505057 is an equidigital number, since it uses as much as digits as its factorization.

990505057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70875, while the sum is 40.

The square root of 990505057 is about 31472.2903043296. The cubic root of 990505057 is about 996.8249487185.

The spelling of 990505057 in words is "nine hundred ninety million, five hundred five thousand, fifty-seven".