79086221 has 2 divisors, whose sum is σ = 79086222. Its totient is φ = 79086220.

The previous prime is 79086211. The next prime is 79086223. The reversal of 79086221 is 12268097.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67010596 + 12075625 = 8186^2 + 3475^2 .

It is a cyclic number.

It is not a de Polignac number, because 79086221 - 2¹⁸ = 78824077 is a prime.

Together with 79086223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79086223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39543110 + 39543111.

It is an arithmetic number, because the mean of its divisors is an integer number (39543111).

Almost surely, 2^79086221 is an apocalyptic number.

It is an amenable number.

79086221 is a deficient number, since it is larger than the sum of its proper divisors (1).

79086221 is an equidigital number, since it uses as much as digits as its factorization.

79086221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 79086221 is about 8893.0434048193. The cubic root of 79086221 is about 429.2400874460.

The spelling of 79086221 in words is "seventy-nine million, eighty-six thousand, two hundred twenty-one".