3131993 has 4 divisors (see below), whose sum is σ = 3152100. Its totient is φ = 3111888.

The previous prime is 3131983. The next prime is 3132007. The reversal of 3131993 is 3991313.

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 597529 + 2534464 = 773^2 + 1592^2 .

It is a cyclic number.

It is not a de Polignac number, because 3131993 - 2⁴ = 3131977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3131983) by changing a digit.

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, 9818 + ... + 10131.

It is an arithmetic number, because the mean of its divisors is an integer number (788025).

Almost surely, 2^3131993 is an apocalyptic number.

It is an amenable number.

3131993 is a deficient number, since it is larger than the sum of its proper divisors (20107).

3131993 is a wasteful number, since it uses less digits than its factorization.

3131993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20106.

The product of its digits is 2187, while the sum is 29.

The square root of 3131993 is about 1769.7437667640. The cubic root of 3131993 is about 146.3098598315.

The spelling of 3131993 in words is "three million, one hundred thirty-one thousand, nine hundred ninety-three".