13131993 has 16 divisors (see below), whose sum is σ = 20197760. Its totient is φ = 7433856.

The previous prime is 13131961. The next prime is 13132001. The reversal of 13131993 is 39913131.

It is a happy number.

It is not a de Polignac number, because 13131993 - 2⁵ = 13131961 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13131993.

It is not an unprimeable number, because it can be changed into a prime (13131593) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 580 + ... + 5157.

It is an arithmetic number, because the mean of its divisors is an integer number (1262360).

Almost surely, 2^13131993 is an apocalyptic number.

It is an amenable number.

13131993 is a deficient number, since it is larger than the sum of its proper divisors (7065767).

13131993 is a wasteful number, since it uses less digits than its factorization.

13131993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5856.

The product of its digits is 2187, while the sum is 30.

The square root of 13131993 is about 3623.8091837181. The cubic root of 13131993 is about 235.9265847004.

The spelling of 13131993 in words is "thirteen million, one hundred thirty-one thousand, nine hundred ninety-three".