77922961 has 2 divisors, whose sum is σ = 77922962. Its totient is φ = 77922960.

The previous prime is 77922941. The next prime is 77922967. The reversal of 77922961 is 16922977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58430736 + 19492225 = 7644^2 + 4415^2 .

It is a cyclic number.

It is not a de Polignac number, because 77922961 - 2¹⁵ = 77890193 is a prime.

It is not a weakly prime, because it can be changed into another prime (77922967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38961480 + 38961481.

It is an arithmetic number, because the mean of its divisors is an integer number (38961481).

Almost surely, 2^77922961 is an apocalyptic number.

It is an amenable number.

77922961 is a deficient number, since it is larger than the sum of its proper divisors (1).

77922961 is an equidigital number, since it uses as much as digits as its factorization.

77922961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 95256, while the sum is 43.

The square root of 77922961 is about 8827.3983143393. The cubic root of 77922961 is about 427.1251545885.

The spelling of 77922961 in words is "seventy-seven million, nine hundred twenty-two thousand, nine hundred sixty-one".