990169177 has 2 divisors, whose sum is σ = 990169178. Its totient is φ = 990169176.

The previous prime is 990169151. The next prime is 990169183. The reversal of 990169177 is 771961099.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 982446336 + 7722841 = 31344^2 + 2779^2 .

It is a cyclic number.

It is not a de Polignac number, because 990169177 - 2⁷ = 990169049 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 990169177.

It is not a weakly prime, because it can be changed into another prime (990169277) 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, 495084588 + 495084589.

It is an arithmetic number, because the mean of its divisors is an integer number (495084589).

Almost surely, 2^990169177 is an apocalyptic number.

It is an amenable number.

990169177 is a deficient number, since it is larger than the sum of its proper divisors (1).

990169177 is an equidigital number, since it uses as much as digits as its factorization.

990169177 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 214326, while the sum is 49.

The square root of 990169177 is about 31466.9537292697. The cubic root of 990169177 is about 996.7122616223.

The spelling of 990169177 in words is "nine hundred ninety million, one hundred sixty-nine thousand, one hundred seventy-seven".