13487431 has 4 divisors (see below), whose sum is σ = 13531672. Its totient is φ = 13443192.

The previous prime is 13487393. The next prime is 13487437. The reversal of 13487431 is 13478431.

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 13487431 - 2¹⁹ = 12963143 is a prime.

It is a super-2 number, since 2×13487431² = 363821589959522, 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 = 13487393 and 13487402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13487437) 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, 21660 + ... + 22273.

It is an arithmetic number, because the mean of its divisors is an integer number (3382918).

Almost surely, 2^13487431 is an apocalyptic number.

13487431 is a deficient number, since it is larger than the sum of its proper divisors (44241).

13487431 is an equidigital number, since it uses as much as digits as its factorization.

13487431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44240.

The product of its digits is 8064, while the sum is 31.

The square root of 13487431 is about 3672.5237916180. The cubic root of 13487431 is about 238.0362383913.

The spelling of 13487431 in words is "thirteen million, four hundred eighty-seven thousand, four hundred thirty-one".