79074221 has 2 divisors, whose sum is σ = 79074222. Its totient is φ = 79074220.

The previous prime is 79074197. The next prime is 79074227. The reversal of 79074221 is 12247097.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61011721 + 18062500 = 7811^2 + 4250^2 .

It is an emirp because it is prime and its reverse (12247097) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79074221 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79074227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39537110 + 39537111.

It is an arithmetic number, because the mean of its divisors is an integer number (39537111).

Almost surely, 2^79074221 is an apocalyptic number.

It is an amenable number.

79074221 is a deficient number, since it is larger than the sum of its proper divisors (1).

79074221 is an equidigital number, since it uses as much as digits as its factorization.

79074221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 79074221 is about 8892.3686945605. The cubic root of 79074221 is about 429.2183763669.

The spelling of 79074221 in words is "seventy-nine million, seventy-four thousand, two hundred twenty-one".