775994977 has 2 divisors, whose sum is σ = 775994978. Its totient is φ = 775994976.

The previous prime is 775994939. The next prime is 775994981. The reversal of 775994977 is 779499577.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 774564561 + 1430416 = 27831^2 + 1196^2 .

It is an emirp because it is prime and its reverse (779499577) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 775994977 - 2²³ = 767606369 is a prime.

It is not a weakly prime, because it can be changed into another prime (775994917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 387997488 + 387997489.

It is an arithmetic number, because the mean of its divisors is an integer number (387997489).

Almost surely, 2^775994977 is an apocalyptic number.

It is an amenable number.

775994977 is a deficient number, since it is larger than the sum of its proper divisors (1).

775994977 is an equidigital number, since it uses as much as digits as its factorization.

775994977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35006580, while the sum is 64.

The square root of 775994977 is about 27856.6863966266. The cubic root of 775994977 is about 918.9381956895.

The spelling of 775994977 in words is "seven hundred seventy-five million, nine hundred ninety-four thousand, nine hundred seventy-seven".