13031965 has 4 divisors (see below), whose sum is σ = 15638364. Its totient is φ = 10425568.

The previous prime is 13031899. The next prime is 13031981. The reversal of 13031965 is 56913031.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9972964 + 3059001 = 3158^2 + 1749^2 .

It is a cyclic number.

It is not a de Polignac number, because 13031965 - 2²¹ = 10934813 is a prime.

It is a super-2 number, since 2×13031965² = 339664223522450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1303192 + ... + 1303201.

It is an arithmetic number, because the mean of its divisors is an integer number (3909591).

Almost surely, 2^13031965 is an apocalyptic number.

It is an amenable number.

13031965 is a deficient number, since it is larger than the sum of its proper divisors (2606399).

13031965 is an equidigital number, since it uses as much as digits as its factorization.

13031965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2606398.

The product of its (nonzero) digits is 2430, while the sum is 28.

The square root of 13031965 is about 3609.9813018906. The cubic root of 13031965 is about 235.3260300405.

Adding to 13031965 its reverse (56913031), we get a palindrome (69944996).

The spelling of 13031965 in words is "thirteen million, thirty-one thousand, nine hundred sixty-five".