13031331 has 8 divisors (see below), whose sum is σ = 17392320. Its totient is φ = 8678952.

The previous prime is 13031329. The next prime is 13031339. The reversal of 13031331 is 13313031.

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

It is not a de Polignac number, because 13031331 - 2¹ = 13031329 is a prime.

It is a super-2 number, since 2×13031331² = 339631175263122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13031331.

It is not an unprimeable number, because it can be changed into a prime (13031339) 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, 3516 + ... + 6198.

It is an arithmetic number, because the mean of its divisors is an integer number (2174040).

Almost surely, 2^13031331 is an apocalyptic number.

13031331 is a deficient number, since it is larger than the sum of its proper divisors (4360989).

13031331 is a wasteful number, since it uses less digits than its factorization.

13031331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4305.

The product of its (nonzero) digits is 81, while the sum is 15.

The square root of 13031331 is about 3609.8934887334. The cubic root of 13031331 is about 235.3222138055.

Adding to 13031331 its reverse (13313031), we get a palindrome (26344362).

The spelling of 13031331 in words is "thirteen million, thirty-one thousand, three hundred thirty-one".