79011112121 has 2 divisors, whose sum is σ = 79011112122. Its totient is φ = 79011112120.

The previous prime is 79011112099. The next prime is 79011112123. The reversal of 79011112121 is 12121111097.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75174672400 + 3836439721 = 274180^2 + 61939^2 .

It is an emirp because it is prime and its reverse (12121111097) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79011112121 is a prime.

Together with 79011112123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (79011112123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39505556060 + 39505556061.

It is an arithmetic number, because the mean of its divisors is an integer number (39505556061).

Almost surely, 2^79011112121 is an apocalyptic number.

It is an amenable number.

79011112121 is a deficient number, since it is larger than the sum of its proper divisors (1).

79011112121 is an equidigital number, since it uses as much as digits as its factorization.

79011112121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 26.

The spelling of 79011112121 in words is "seventy-nine billion, eleven million, one hundred twelve thousand, one hundred twenty-one".