13121313 has 4 divisors (see below), whose sum is σ = 17495088. Its totient is φ = 8747540.

The previous prime is 13121309. The next prime is 13121327. The reversal of 13121313 is 31312131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13121313 - 2² = 13121309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13121292 and 13121301.

It is not an unprimeable number, because it can be changed into a prime (13121813) 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, 2186883 + ... + 2186888.

It is an arithmetic number, because the mean of its divisors is an integer number (4373772).

Almost surely, 2^13121313 is an apocalyptic number.

It is an amenable number.

13121313 is a deficient number, since it is larger than the sum of its proper divisors (4373775).

13121313 is an equidigital number, since it uses as much as digits as its factorization.

13121313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4373774.

The product of its digits is 54, while the sum is 15.

The square root of 13121313 is about 3622.3352964628. The cubic root of 13121313 is about 235.8626091533.

Adding to 13121313 its reverse (31312131), we get a palindrome (44433444).

It can be divided in two parts, 1312131 and 3, that multiplied together give a palindrome (3936393).

The spelling of 13121313 in words is "thirteen million, one hundred twenty-one thousand, three hundred thirteen".