79139677 has 2 divisors, whose sum is σ = 79139678. Its totient is φ = 79139676.

The previous prime is 79139657. The next prime is 79139699. The reversal of 79139677 is 77693197.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75794436 + 3345241 = 8706^2 + 1829^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79139677 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 79139677.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79139647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39569838 + 39569839.

It is an arithmetic number, because the mean of its divisors is an integer number (39569839).

Almost surely, 2^79139677 is an apocalyptic number.

It is an amenable number.

79139677 is a deficient number, since it is larger than the sum of its proper divisors (1).

79139677 is an equidigital number, since it uses as much as digits as its factorization.

79139677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 500094, while the sum is 49.

The square root of 79139677 is about 8896.0483924043. The cubic root of 79139677 is about 429.3367763929.

The spelling of 79139677 in words is "seventy-nine million, one hundred thirty-nine thousand, six hundred seventy-seven".