79072121 has 2 divisors, whose sum is σ = 79072122. Its totient is φ = 79072120.

The previous prime is 79072111. The next prime is 79072157. The reversal of 79072121 is 12127097.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73960000 + 5112121 = 8600^2 + 2261^2 .

It is a cyclic number.

It is not a de Polignac number, because 79072121 - 2¹⁴ = 79055737 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79072111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39536060 + 39536061.

It is an arithmetic number, because the mean of its divisors is an integer number (39536061).

Almost surely, 2^79072121 is an apocalyptic number.

It is an amenable number.

79072121 is a deficient number, since it is larger than the sum of its proper divisors (1).

79072121 is an equidigital number, since it uses as much as digits as its factorization.

79072121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1764, while the sum is 29.

The square root of 79072121 is about 8892.2506150018. The cubic root of 79072121 is about 429.2145767022.

The spelling of 79072121 in words is "seventy-nine million, seventy-two thousand, one hundred twenty-one".