13131909 has 16 divisors (see below), whose sum is σ = 22234240. Its totient is φ = 7503840.

The previous prime is 13131901. The next prime is 13131917. The reversal of 13131909 is 90913131.

It is an interprime number because it is at equal distance from previous prime (13131901) and next prime (13131917).

It is not a de Polignac number, because 13131909 - 2³ = 13131901 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13131901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34552 + ... + 34929.

It is an arithmetic number, because the mean of its divisors is an integer number (1389640).

Almost surely, 2^13131909 is an apocalyptic number.

It is an amenable number.

13131909 is a deficient number, since it is larger than the sum of its proper divisors (9102331).

13131909 is an equidigital number, since it uses as much as digits as its factorization.

13131909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69497 (or 69491 counting only the distinct ones).

The product of its (nonzero) digits is 729, while the sum is 27.

The square root of 13131909 is about 3623.7975936854. The cubic root of 13131909 is about 235.9260816573.

The spelling of 13131909 in words is "thirteen million, one hundred thirty-one thousand, nine hundred nine".