79901260121 has 4 divisors (see below), whose sum is σ = 80005163700. Its totient is φ = 79797356544.

The previous prime is 79901260097. The next prime is 79901260123. The reversal of 79901260121 is 12106210997.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35796640000 + 44104620121 = 189200^2 + 210011^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79901260121 is a prime.

It is a super-2 number, since 2×79901260121² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (79901260123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51950636 + ... + 51952173.

It is an arithmetic number, because the mean of its divisors is an integer number (20001290925).

Almost surely, 2^79901260121 is an apocalyptic number.

It is an amenable number.

79901260121 is a deficient number, since it is larger than the sum of its proper divisors (103903579).

79901260121 is a wasteful number, since it uses less digits than its factorization.

79901260121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103903578.

The product of its (nonzero) digits is 13608, while the sum is 38.

The spelling of 79901260121 in words is "seventy-nine billion, nine hundred one million, two hundred sixty thousand, one hundred twenty-one".