13731431 has 4 divisors (see below), whose sum is σ = 15693072. Its totient is φ = 11769792.

The previous prime is 13731409. The next prime is 13731439. The reversal of 13731431 is 13413731.

13731431 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 a de Polignac number, because none of the positive numbers 2^k-13731431 is a prime.

It is a super-2 number, since 2×13731431² = 377104394615522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13731397 and 13731406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13731439) 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, 980810 + ... + 980823.

It is an arithmetic number, because the mean of its divisors is an integer number (3923268).

Almost surely, 2^13731431 is an apocalyptic number.

13731431 is a deficient number, since it is larger than the sum of its proper divisors (1961641).

13731431 is an equidigital number, since it uses as much as digits as its factorization.

13731431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1961640.

The product of its digits is 756, while the sum is 23.

The square root of 13731431 is about 3705.5945541843. The cubic root of 13731431 is about 239.4630995722.

The spelling of 13731431 in words is "thirteen million, seven hundred thirty-one thousand, four hundred thirty-one".