490591961 has 2 divisors, whose sum is σ = 490591962. Its totient is φ = 490591960.

The previous prime is 490591943. The next prime is 490592017. The reversal of 490591961 is 169195094.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 490356736 + 235225 = 22144^2 + 485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-490591961 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (490591921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245295980 + 245295981.

It is an arithmetic number, because the mean of its divisors is an integer number (245295981).

Almost surely, 2^490591961 is an apocalyptic number.

It is an amenable number.

490591961 is a deficient number, since it is larger than the sum of its proper divisors (1).

490591961 is an equidigital number, since it uses as much as digits as its factorization.

490591961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 490591961 is about 22149.3106213263. The cubic root of 490591961 is about 788.6908622759.

The spelling of 490591961 in words is "four hundred ninety million, five hundred ninety-one thousand, nine hundred sixty-one".