13251139 has 4 divisors (see below), whose sum is σ = 14455800. Its totient is φ = 12046480.

The previous prime is 13251137. The next prime is 13251157. The reversal of 13251139 is 93115231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13251139 - 2¹ = 13251137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13251131) 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, 602314 + ... + 602335.

It is an arithmetic number, because the mean of its divisors is an integer number (3613950).

Almost surely, 2^13251139 is an apocalyptic number.

13251139 is a deficient number, since it is larger than the sum of its proper divisors (1204661).

13251139 is a wasteful number, since it uses less digits than its factorization.

13251139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1204660.

The product of its digits is 810, while the sum is 25.

The square root of 13251139 is about 3640.2113949605. The cubic root of 13251139 is about 236.6379548144.

It can be divided in two parts, 13 and 251139, that added together give a palindrome (251152).

The spelling of 13251139 in words is "thirteen million, two hundred fifty-one thousand, one hundred thirty-nine".