79513125121 has 2 divisors, whose sum is σ = 79513125122. Its totient is φ = 79513125120.

The previous prime is 79513125119. The next prime is 79513125143. The reversal of 79513125121 is 12152131597.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76568977521 + 2944147600 = 276711^2 + 54260^2 .

It is an emirp because it is prime and its reverse (12152131597) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79513125121 - 2¹ = 79513125119 is a prime.

Together with 79513125119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (79513125161) 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, 39756562560 + 39756562561.

It is an arithmetic number, because the mean of its divisors is an integer number (39756562561).

Almost surely, 2^79513125121 is an apocalyptic number.

It is an amenable number.

79513125121 is a deficient number, since it is larger than the sum of its proper divisors (1).

79513125121 is an equidigital number, since it uses as much as digits as its factorization.

79513125121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18900, while the sum is 37.

The spelling of 79513125121 in words is "seventy-nine billion, five hundred thirteen million, one hundred twenty-five thousand, one hundred twenty-one".