79116221 has 2 divisors, whose sum is σ = 79116222. Its totient is φ = 79116220.

The previous prime is 79116217. The next prime is 79116253. The reversal of 79116221 is 12261197.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70324996 + 8791225 = 8386^2 + 2965^2 .

It is a cyclic number.

It is not a de Polignac number, because 79116221 - 2² = 79116217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79116421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39558110 + 39558111.

It is an arithmetic number, because the mean of its divisors is an integer number (39558111).

Almost surely, 2^79116221 is an apocalyptic number.

It is an amenable number.

79116221 is a deficient number, since it is larger than the sum of its proper divisors (1).

79116221 is an equidigital number, since it uses as much as digits as its factorization.

79116221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1512, while the sum is 29.

The square root of 79116221 is about 8894.7299565529. The cubic root of 79116221 is about 429.2943555370.

The spelling of 79116221 in words is "seventy-nine million, one hundred sixteen thousand, two hundred twenty-one".