13387531 has 4 divisors (see below), whose sum is σ = 13849200. Its totient is φ = 12925864.

The previous prime is 13387523. The next prime is 13387553. The reversal of 13387531 is 13578331.

It is a happy number.

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 13387531 - 2³ = 13387523 is a prime.

It is a super-2 number, since 2×13387531² = 358451972551922, 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 = 13387493 and 13387502.

It is not an unprimeable number, because it can be changed into a prime (13387331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230791 + ... + 230848.

It is an arithmetic number, because the mean of its divisors is an integer number (3462300).

Almost surely, 2^13387531 is an apocalyptic number.

13387531 is a deficient number, since it is larger than the sum of its proper divisors (461669).

13387531 is an equidigital number, since it uses as much as digits as its factorization.

13387531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461668.

The product of its digits is 7560, while the sum is 31.

The square root of 13387531 is about 3658.8975115463. The cubic root of 13387531 is about 237.4470781437.

The spelling of 13387531 in words is "thirteen million, three hundred eighty-seven thousand, five hundred thirty-one".