13731731 has 4 divisors (see below), whose sum is σ = 14788032. Its totient is φ = 12675432.

The previous prime is 13731727. The next prime is 13731743. The reversal of 13731731 is 13713731.

13731731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 13731731 - 2² = 13731727 is a prime.

It is a super-2 number, since 2×13731731² = 377120872512722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13731731.

It is not an unprimeable number, because it can be changed into a prime (13731031) 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, 528131 + ... + 528156.

It is an arithmetic number, because the mean of its divisors is an integer number (3697008).

Almost surely, 2^13731731 is an apocalyptic number.

13731731 is a deficient number, since it is larger than the sum of its proper divisors (1056301).

13731731 is a wasteful number, since it uses less digits than its factorization.

13731731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056300.

The product of its digits is 1323, while the sum is 26.

The square root of 13731731 is about 3705.6350332973. The cubic root of 13731731 is about 239.4648434644.

The spelling of 13731731 in words is "thirteen million, seven hundred thirty-one thousand, seven hundred thirty-one".