977966909 has 2 divisors, whose sum is σ = 977966910. Its totient is φ = 977966908.

The previous prime is 977966893. The next prime is 977966921. The reversal of 977966909 is 909669779.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 655872100 + 322094809 = 25610^2 + 17947^2 .

It is a cyclic number.

It is not a de Polignac number, because 977966909 - 2⁴ = 977966893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (977966959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 488983454 + 488983455.

It is an arithmetic number, because the mean of its divisors is an integer number (488983455).

Almost surely, 2^977966909 is an apocalyptic number.

It is an amenable number.

977966909 is a deficient number, since it is larger than the sum of its proper divisors (1).

977966909 is an equidigital number, since it uses as much as digits as its factorization.

977966909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11573604, while the sum is 62.

The square root of 977966909 is about 31272.4624709983. The cubic root of 977966909 is about 992.6010265436.

The spelling of 977966909 in words is "nine hundred seventy-seven million, nine hundred sixty-six thousand, nine hundred nine".