79711381 has 2 divisors, whose sum is σ = 79711382. Its totient is φ = 79711380.

The previous prime is 79711363. The next prime is 79711393. The reversal of 79711381 is 18311797.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70408881 + 9302500 = 8391^2 + 3050^2 .

It is a cyclic number.

It is not a de Polignac number, because 79711381 - 2⁵ = 79711349 is a prime.

It is a super-2 number, since 2×79711381² = 12707808521854322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 79711381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79711781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39855690 + 39855691.

It is an arithmetic number, because the mean of its divisors is an integer number (39855691).

Almost surely, 2^79711381 is an apocalyptic number.

It is an amenable number.

79711381 is a deficient number, since it is larger than the sum of its proper divisors (1).

79711381 is an equidigital number, since it uses as much as digits as its factorization.

79711381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10584, while the sum is 37.

The square root of 79711381 is about 8928.1230390267. The cubic root of 79711381 is about 430.3681379523.

Subtracting from 79711381 its product of digits (10584), we obtain a palindrome (79700797).

The spelling of 79711381 in words is "seventy-nine million, seven hundred eleven thousand, three hundred eighty-one".