3131666813 has 4 divisors (see below), whose sum is σ = 3416363808. Its totient is φ = 2846969820.

The previous prime is 3131666807. The next prime is 3131666833. The reversal of 3131666813 is 3186661313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3186661313 = 11 ⋅289696483.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3131666813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3131666833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142348481 + ... + 142348502.

It is an arithmetic number, because the mean of its divisors is an integer number (854090952).

Almost surely, 2^3131666813 is an apocalyptic number.

It is an amenable number.

3131666813 is a deficient number, since it is larger than the sum of its proper divisors (284696995).

3131666813 is a wasteful number, since it uses less digits than its factorization.

3131666813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284696994.

The product of its digits is 46656, while the sum is 38.

The square root of 3131666813 is about 55961.2974563671. The cubic root of 3131666813 is about 1463.0478042135.

The spelling of 3131666813 in words is "three billion, one hundred thirty-one million, six hundred sixty-six thousand, eight hundred thirteen".