495776989 has 2 divisors, whose sum is σ = 495776990. Its totient is φ = 495776988.

The previous prime is 495776977. The next prime is 495777047. The reversal of 495776989 is 989677594.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 420660100 + 75116889 = 20510^2 + 8667^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-495776989 is a prime.

It is a super-2 number, since 2×495776989² = 491589645643812242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 495776989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (495776969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247888494 + 247888495.

It is an arithmetic number, because the mean of its divisors is an integer number (247888495).

Almost surely, 2^495776989 is an apocalyptic number.

It is an amenable number.

495776989 is a deficient number, since it is larger than the sum of its proper divisors (1).

495776989 is an equidigital number, since it uses as much as digits as its factorization.

495776989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34292160, while the sum is 64.

The square root of 495776989 is about 22266.0501436604. The cubic root of 495776989 is about 791.4596679462.

The spelling of 495776989 in words is "four hundred ninety-five million, seven hundred seventy-six thousand, nine hundred eighty-nine".