79005221 has 2 divisors, whose sum is σ = 79005222. Its totient is φ = 79005220.

The previous prime is 79005217. The next prime is 79005257. The reversal of 79005221 is 12250097.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42837025 + 36168196 = 6545^2 + 6014^2 .

It is an emirp because it is prime and its reverse (12250097) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79005221 - 2² = 79005217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79005721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39502610 + 39502611.

It is an arithmetic number, because the mean of its divisors is an integer number (39502611).

Almost surely, 2^79005221 is an apocalyptic number.

It is an amenable number.

79005221 is a deficient number, since it is larger than the sum of its proper divisors (1).

79005221 is an equidigital number, since it uses as much as digits as its factorization.

79005221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 79005221 is about 8888.4881166597. The cubic root of 79005221 is about 429.0934950167.

The spelling of 79005221 in words is "seventy-nine million, five thousand, two hundred twenty-one".