490864889 has 2 divisors, whose sum is σ = 490864890. Its totient is φ = 490864888.

The previous prime is 490864859. The next prime is 490864901. The reversal of 490864889 is 988468094.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 453349264 + 37515625 = 21292^2 + 6125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-490864889 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (490864859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245432444 + 245432445.

It is an arithmetic number, because the mean of its divisors is an integer number (245432445).

Almost surely, 2^490864889 is an apocalyptic number.

It is an amenable number.

490864889 is a deficient number, since it is larger than the sum of its proper divisors (1).

490864889 is an equidigital number, since it uses as much as digits as its factorization.

490864889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3981312, while the sum is 56.

The square root of 490864889 is about 22155.4708593611. The cubic root of 490864889 is about 788.8370910035.

The spelling of 490864889 in words is "four hundred ninety million, eight hundred sixty-four thousand, eight hundred eighty-nine".