13431531 has 8 divisors (see below), whose sum is σ = 17926720. Its totient is φ = 8945352.

The previous prime is 13431521. The next prime is 13431533. The reversal of 13431531 is 13513431.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13431531 - 2⁷ = 13431403 is a prime.

It is a super-2 number, since 2×13431531² = 360812050007922, 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 = 13431498 and 13431507.

It is not an unprimeable number, because it can be changed into a prime (13431533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2940 + ... + 5958.

It is an arithmetic number, because the mean of its divisors is an integer number (2240840).

Almost surely, 2^13431531 is an apocalyptic number.

13431531 is a deficient number, since it is larger than the sum of its proper divisors (4495189).

13431531 is a wasteful number, since it uses less digits than its factorization.

13431531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4505.

The product of its digits is 540, while the sum is 21.

The square root of 13431531 is about 3664.9053193773. The cubic root of 13431531 is about 237.7069280588.

Adding to 13431531 its reverse (13513431), we get a palindrome (26944962).

The spelling of 13431531 in words is "thirteen million, four hundred thirty-one thousand, five hundred thirty-one".