3121666731 has 24 divisors (see below), whose sum is σ = 4783800320. Its totient is φ = 1956041136.

The previous prime is 3121666711. The next prime is 3121666753. The reversal of 3121666731 is 1376661213.

3121666731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3121666731 - 2⁵ = 3121666699 is a prime.

It is a super-2 number, since 2×3121666731² = 19489606358864452722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3121666711) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50155 + ... + 93588.

Almost surely, 2^3121666731 is an apocalyptic number.

3121666731 is a deficient number, since it is larger than the sum of its proper divisors (1662133589).

3121666731 is a wasteful number, since it uses less digits than its factorization.

3121666731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143895 (or 143892 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 3121666731 is about 55871.8778188097. The cubic root of 3121666731 is about 1461.4888688341.

The spelling of 3121666731 in words is "three billion, one hundred twenty-one million, six hundred sixty-six thousand, seven hundred thirty-one".