13121879 has 4 divisors (see below), whose sum is σ = 13184280. Its totient is φ = 13059480.

The previous prime is 13121873. The next prime is 13121881. The reversal of 13121879 is 97812131.

13121879 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97812131 = 109 ⋅897359.

It is a cyclic number.

It is not a de Polignac number, because 13121879 - 2⁴ = 13121863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121873) 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, 30884 + ... + 31305.

It is an arithmetic number, because the mean of its divisors is an integer number (3296070).

Almost surely, 2^13121879 is an apocalyptic number.

13121879 is a deficient number, since it is larger than the sum of its proper divisors (62401).

13121879 is an equidigital number, since it uses as much as digits as its factorization.

13121879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62400.

The product of its digits is 3024, while the sum is 32.

The square root of 13121879 is about 3622.4134220158. The cubic root of 13121879 is about 235.8660004887.

The spelling of 13121879 in words is "thirteen million, one hundred twenty-one thousand, eight hundred seventy-nine".