79994221 has 2 divisors, whose sum is σ = 79994222. Its totient is φ = 79994220.

The previous prime is 79994177. The next prime is 79994227. The reversal of 79994221 is 12249997.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51638596 + 28355625 = 7186^2 + 5325^2 .

It is a cyclic number.

It is not a de Polignac number, because 79994221 - 2¹¹ = 79992173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79994227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39997110 + 39997111.

It is an arithmetic number, because the mean of its divisors is an integer number (39997111).

Almost surely, 2^79994221 is an apocalyptic number.

It is an amenable number.

79994221 is a deficient number, since it is larger than the sum of its proper divisors (1).

79994221 is an equidigital number, since it uses as much as digits as its factorization.

79994221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 43.

The square root of 79994221 is about 8943.9488482437. The cubic root of 79994221 is about 430.8765623581.

The spelling of 79994221 in words is "seventy-nine million, nine hundred ninety-four thousand, two hundred twenty-one".