13231509 has 16 divisors (see below), whose sum is σ = 18582912. Its totient is φ = 8357888.

The previous prime is 13231481. The next prime is 13231523. The reversal of 13231509 is 90513231.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 13231509 - 2¹² = 13227413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13231529) 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, 6949 + ... + 8645.

It is an arithmetic number, because the mean of its divisors is an integer number (1161432).

Almost surely, 2^13231509 is an apocalyptic number.

It is an amenable number.

13231509 is a deficient number, since it is larger than the sum of its proper divisors (5351403).

13231509 is a wasteful number, since it uses less digits than its factorization.

13231509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1836.

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 13231509 is about 3637.5141236839. The cubic root of 13231509 is about 236.5210466574.

The spelling of 13231509 in words is "thirteen million, two hundred thirty-one thousand, five hundred nine".