77140961 has 2 divisors, whose sum is σ = 77140962. Its totient is φ = 77140960.

The previous prime is 77140949. The next prime is 77140979. The reversal of 77140961 is 16904177.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41667025 + 35473936 = 6455^2 + 5956^2 .

It is a cyclic number.

It is not a de Polignac number, because 77140961 - 2⁶ = 77140897 is a prime.

It is not a weakly prime, because it can be changed into another prime (77140991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38570480 + 38570481.

It is an arithmetic number, because the mean of its divisors is an integer number (38570481).

Almost surely, 2^77140961 is an apocalyptic number.

It is an amenable number.

77140961 is a deficient number, since it is larger than the sum of its proper divisors (1).

77140961 is an equidigital number, since it uses as much as digits as its factorization.

77140961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 77140961 is about 8782.9927131929. The cubic root of 77140961 is about 425.6915357539.

The spelling of 77140961 in words is "seventy-seven million, one hundred forty thousand, nine hundred sixty-one".