13731507 has 6 divisors (see below), whose sum is σ = 19834412. Its totient is φ = 9154332.

The previous prime is 13731499. The next prime is 13731511. The reversal of 13731507 is 70513731.

13731507 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13731507 - 2³ = 13731499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13731517) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 762853 + ... + 762870.

Almost surely, 2^13731507 is an apocalyptic number.

13731507 is a deficient number, since it is larger than the sum of its proper divisors (6102905).

13731507 is a wasteful number, since it uses less digits than its factorization.

13731507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1525729 (or 1525726 counting only the distinct ones).

The product of its (nonzero) digits is 2205, while the sum is 27.

The square root of 13731507 is about 3705.6048089347. The cubic root of 13731507 is about 239.4635413606.

The spelling of 13731507 in words is "thirteen million, seven hundred thirty-one thousand, five hundred seven".