79139911 has 2 divisors, whose sum is σ = 79139912. Its totient is φ = 79139910.

The previous prime is 79139891. The next prime is 79139917. The reversal of 79139911 is 11993197.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 79139911 - 2¹⁹ = 78615623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79139917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39569955 + 39569956.

It is an arithmetic number, because the mean of its divisors is an integer number (39569956).

Almost surely, 2^79139911 is an apocalyptic number.

79139911 is a deficient number, since it is larger than the sum of its proper divisors (1).

79139911 is an equidigital number, since it uses as much as digits as its factorization.

79139911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15309, while the sum is 40.

The square root of 79139911 is about 8896.0615443015. The cubic root of 79139911 is about 429.3371995465.

The spelling of 79139911 in words is "seventy-nine million, one hundred thirty-nine thousand, nine hundred eleven".