13081979 has 4 divisors (see below), whose sum is σ = 13435584. Its totient is φ = 12728376.

The previous prime is 13081973. The next prime is 13081997. The reversal of 13081979 is 97918031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97918031 = 1777 ⋅55103.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13081979 is a prime.

It is a super-2 number, since 2×13081979² = 342276349112882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13081973) 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, 176747 + ... + 176820.

It is an arithmetic number, because the mean of its divisors is an integer number (3358896).

Almost surely, 2^13081979 is an apocalyptic number.

13081979 is a deficient number, since it is larger than the sum of its proper divisors (353605).

13081979 is an equidigital number, since it uses as much as digits as its factorization.

13081979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353604.

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

The square root of 13081979 is about 3616.9018510322. The cubic root of 13081979 is about 235.6266900371.

The spelling of 13081979 in words is "thirteen million, eighty-one thousand, nine hundred seventy-nine".