79911961 has 2 divisors, whose sum is σ = 79911962. Its totient is φ = 79911960.

The previous prime is 79911947. The next prime is 79911983. The reversal of 79911961 is 16911997.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77528025 + 2383936 = 8805^2 + 1544^2 .

It is a cyclic number.

It is not a de Polignac number, because 79911961 - 2¹⁷ = 79780889 is a prime.

It is not a weakly prime, because it can be changed into another prime (79912961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39955980 + 39955981.

It is an arithmetic number, because the mean of its divisors is an integer number (39955981).

Almost surely, 2^79911961 is an apocalyptic number.

It is an amenable number.

79911961 is a deficient number, since it is larger than the sum of its proper divisors (1).

79911961 is an equidigital number, since it uses as much as digits as its factorization.

79911961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30618, while the sum is 43.

The square root of 79911961 is about 8939.3490255163. The cubic root of 79911961 is about 430.7288180928.

The spelling of 79911961 in words is "seventy-nine million, nine hundred eleven thousand, nine hundred sixty-one".