77918413 has 2 divisors, whose sum is σ = 77918414. Its totient is φ = 77918412.

The previous prime is 77918381. The next prime is 77918417. The reversal of 77918413 is 31481977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61418569 + 16499844 = 7837^2 + 4062^2 .

It is a cyclic number.

It is not a de Polignac number, because 77918413 - 2⁵ = 77918381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77918417) 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, 38959206 + 38959207.

It is an arithmetic number, because the mean of its divisors is an integer number (38959207).

Almost surely, 2^77918413 is an apocalyptic number.

It is an amenable number.

77918413 is a deficient number, since it is larger than the sum of its proper divisors (1).

77918413 is an equidigital number, since it uses as much as digits as its factorization.

77918413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 40.

The square root of 77918413 is about 8827.1407035348. The cubic root of 77918413 is about 427.1168446587.

The spelling of 77918413 in words is "seventy-seven million, nine hundred eighteen thousand, four hundred thirteen".