13121979 has 16 divisors (see below), whose sum is σ = 19084800. Its totient is φ = 7970976.

The previous prime is 13121971. The next prime is 13121987. The reversal of 13121979 is 97912131.

It is an interprime number because it is at equal distance from previous prime (13121971) and next prime (13121987).

It is not a de Polignac number, because 13121979 - 2³ = 13121971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13121971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 952 + ... + 5210.

It is an arithmetic number, because the mean of its divisors is an integer number (1192800).

Almost surely, 2^13121979 is an apocalyptic number.

13121979 is a deficient number, since it is larger than the sum of its proper divisors (5962821).

13121979 is a wasteful number, since it uses less digits than its factorization.

13121979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4354.

The product of its digits is 3402, while the sum is 33.

The square root of 13121979 is about 3622.4272249419. The cubic root of 13121979 is about 235.8665996544.

It can be divided in two parts, 131219 and 79, that multiplied together give a palindrome (10366301).

The spelling of 13121979 in words is "thirteen million, one hundred twenty-one thousand, nine hundred seventy-nine".