13389531 has 4 divisors (see below), whose sum is σ = 17852712. Its totient is φ = 8926352.

The previous prime is 13389511. The next prime is 13389533. The reversal of 13389531 is 13598331.

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 13389531 - 2⁷ = 13389403 is a prime.

It is a super-2 number, since 2×13389531² = 358559080799922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13389492 and 13389501.

It is not an unprimeable number, because it can be changed into a prime (13389533) 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, 2231586 + ... + 2231591.

It is an arithmetic number, because the mean of its divisors is an integer number (4463178).

Almost surely, 2^13389531 is an apocalyptic number.

13389531 is a deficient number, since it is larger than the sum of its proper divisors (4463181).

13389531 is an equidigital number, since it uses as much as digits as its factorization.

13389531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4463180.

The product of its digits is 9720, while the sum is 33.

The square root of 13389531 is about 3659.1708077104. The cubic root of 13389531 is about 237.4589018452.

The spelling of 13389531 in words is "thirteen million, three hundred eighty-nine thousand, five hundred thirty-one".