13378913 has 4 divisors (see below), whose sum is σ = 13387668. Its totient is φ = 13370160.

The previous prime is 13378903. The next prime is 13378921. The reversal of 13378913 is 31987331.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 31987331 = 701 ⋅45631.

It can be written as a sum of positive squares in 2 ways, for example, as 4276624 + 9102289 = 2068^2 + 3017^2 .

It is a cyclic number.

It is not a de Polignac number, because 13378913 - 2²⁰ = 12330337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13378903) 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, 1418 + ... + 5363.

It is an arithmetic number, because the mean of its divisors is an integer number (3346917).

Almost surely, 2^13378913 is an apocalyptic number.

It is an amenable number.

13378913 is a deficient number, since it is larger than the sum of its proper divisors (8755).

13378913 is an equidigital number, since it uses as much as digits as its factorization.

13378913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8754.

The product of its digits is 13608, while the sum is 35.

The square root of 13378913 is about 3657.7196448060. The cubic root of 13378913 is about 237.3961163403.

The spelling of 13378913 in words is "thirteen million, three hundred seventy-eight thousand, nine hundred thirteen".