309759984977 has 2 divisors, whose sum is σ = 309759984978. Its totient is φ = 309759984976.

The previous prime is 309759984971. The next prime is 309759985057. The reversal of 309759984977 is 779489957903.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180148464721 + 129611520256 = 424439^2 + 360016^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-309759984977 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 309759984898 and 309759984907.

It is not a weakly prime, because it can be changed into another prime (309759984971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154879992488 + 154879992489.

It is an arithmetic number, because the mean of its divisors is an integer number (154879992489).

Almost surely, 2^309759984977 is an apocalyptic number.

It is an amenable number.

309759984977 is a deficient number, since it is larger than the sum of its proper divisors (1).

309759984977 is an equidigital number, since it uses as much as digits as its factorization.

309759984977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080203040, while the sum is 77.

The spelling of 309759984977 in words is "three hundred nine billion, seven hundred fifty-nine million, nine hundred eighty-four thousand, nine hundred seventy-seven".