79680961 has 2 divisors, whose sum is σ = 79680962. Its totient is φ = 79680960.

The previous prime is 79680959. The next prime is 79680973. The reversal of 79680961 is 16908697.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61779600 + 17901361 = 7860^2 + 4231^2 .

It is a cyclic number.

It is not a de Polignac number, because 79680961 - 2¹ = 79680959 is a prime.

Together with 79680959, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (79680061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39840480 + 39840481.

It is an arithmetic number, because the mean of its divisors is an integer number (39840481).

Almost surely, 2^79680961 is an apocalyptic number.

It is an amenable number.

79680961 is a deficient number, since it is larger than the sum of its proper divisors (1).

79680961 is an equidigital number, since it uses as much as digits as its factorization.

79680961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 79680961 is about 8926.4192709059. The cubic root of 79680961 is about 430.3133843135.

The spelling of 79680961 in words is "seventy-nine million, six hundred eighty thousand, nine hundred sixty-one".