79716181 has 2 divisors, whose sum is σ = 79716182. Its totient is φ = 79716180.

The previous prime is 79716163. The next prime is 79716193. The reversal of 79716181 is 18161797.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64545156 + 15171025 = 8034^2 + 3895^2 .

It is a cyclic number.

It is not a de Polignac number, because 79716181 - 2⁵ = 79716149 is a prime.

It is a super-2 number, since 2×79716181² = 12709339026449522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79716101) 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, 39858090 + 39858091.

It is an arithmetic number, because the mean of its divisors is an integer number (39858091).

Almost surely, 2^79716181 is an apocalyptic number.

It is an amenable number.

79716181 is a deficient number, since it is larger than the sum of its proper divisors (1).

79716181 is an equidigital number, since it uses as much as digits as its factorization.

79716181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 40.

The square root of 79716181 is about 8928.3918484798. The cubic root of 79716181 is about 430.3767763072.

It can be divided in two parts, 79716 and 181, that added together give a palindrome (79897).

The spelling of 79716181 in words is "seventy-nine million, seven hundred sixteen thousand, one hundred eighty-one".