79906121 has 2 divisors, whose sum is σ = 79906122. Its totient is φ = 79906120.

The previous prime is 79906097. The next prime is 79906147. The reversal of 79906121 is 12160997.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79905721 + 400 = 8939^2 + 20^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79906121 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79906621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39953060 + 39953061.

It is an arithmetic number, because the mean of its divisors is an integer number (39953061).

Almost surely, 2^79906121 is an apocalyptic number.

It is an amenable number.

79906121 is a deficient number, since it is larger than the sum of its proper divisors (1).

79906121 is an equidigital number, since it uses as much as digits as its factorization.

79906121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 79906121 is about 8939.0223738393. The cubic root of 79906121 is about 430.7183252223.

The spelling of 79906121 in words is "seventy-nine million, nine hundred six thousand, one hundred twenty-one".