77311909 has 2 divisors, whose sum is σ = 77311910. Its totient is φ = 77311908.

The previous prime is 77311873. The next prime is 77311933. The reversal of 77311909 is 90911377.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62062884 + 15249025 = 7878^2 + 3905^2 .

It is a cyclic number.

It is not a de Polignac number, because 77311909 - 2⁹ = 77311397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77341909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38655954 + 38655955.

It is an arithmetic number, because the mean of its divisors is an integer number (38655955).

Almost surely, 2^77311909 is an apocalyptic number.

It is an amenable number.

77311909 is a deficient number, since it is larger than the sum of its proper divisors (1).

77311909 is an equidigital number, since it uses as much as digits as its factorization.

77311909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11907, while the sum is 37.

The square root of 77311909 is about 8792.7190902473. The cubic root of 77311909 is about 426.0057545859.

The spelling of 77311909 in words is "seventy-seven million, three hundred eleven thousand, nine hundred nine".