76977961 has 2 divisors, whose sum is σ = 76977962. Its totient is φ = 76977960.

The previous prime is 76977959. The next prime is 76978007. The reversal of 76977961 is 16977967.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64304361 + 12673600 = 8019^2 + 3560^2 .

It is a cyclic number.

It is not a de Polignac number, because 76977961 - 2¹ = 76977959 is a prime.

Together with 76977959, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 76977899 and 76977908.

It is not a weakly prime, because it can be changed into another prime (76977161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38488980 + 38488981.

It is an arithmetic number, because the mean of its divisors is an integer number (38488981).

Almost surely, 2^76977961 is an apocalyptic number.

It is an amenable number.

76977961 is a deficient number, since it is larger than the sum of its proper divisors (1).

76977961 is an equidigital number, since it uses as much as digits as its factorization.

76977961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1000188, while the sum is 52.

The square root of 76977961 is about 8773.7085089488. The cubic root of 76977961 is about 425.3914934706.

The spelling of 76977961 in words is "seventy-six million, nine hundred seventy-seven thousand, nine hundred sixty-one".