77956997 has 2 divisors, whose sum is σ = 77956998. Its totient is φ = 77956996.

The previous prime is 77956939. The next prime is 77956999. The reversal of 77956997 is 79965977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42328036 + 35628961 = 6506^2 + 5969^2 .

It is a cyclic number.

It is not a de Polignac number, because 77956997 - 2⁶ = 77956933 is a prime.

Together with 77956999, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77956999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38978498 + 38978499.

It is an arithmetic number, because the mean of its divisors is an integer number (38978499).

Almost surely, 2^77956997 is an apocalyptic number.

It is an amenable number.

77956997 is a deficient number, since it is larger than the sum of its proper divisors (1).

77956997 is an equidigital number, since it uses as much as digits as its factorization.

77956997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7501410, while the sum is 59.

The square root of 77956997 is about 8829.3259652139. The cubic root of 77956997 is about 427.1873335896.

The spelling of 77956997 in words is "seventy-seven million, nine hundred fifty-six thousand, nine hundred ninety-seven".