3121568641 has 3 divisors (see below), whose sum is σ = 3121624513. Its totient is φ = 3121512770.

The previous prime is 3121568629. The next prime is 3121568669. The reversal of 3121568641 is 1468651213.

It is a happy number.

The square root of 3121568641 is 55871.

It is a perfect power (a square), and thus also a powerful number.

3121568641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1468651213 = 491 ⋅2991143.

It is not a de Polignac number, because 3121568641 - 2²³ = 3113180033 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3121568641.

It is not an unprimeable number, because it can be changed into a prime (3121568621) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 27936 + ... + 83806.

Almost surely, 2^3121568641 is an apocalyptic number.

3121568641 is the 55871-st square number.

3121568641 is the 27936-th centered octagonal number.

It is an amenable number.

3121568641 is a deficient number, since it is larger than the sum of its proper divisors (55872).

3121568641 is an frugal number, since it uses more digits than its factorization.

3121568641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111742 (or 55871 counting only the distinct ones).

The product of its digits is 34560, while the sum is 37.

The cubic root of 3121568641 is about 1461.4735608852.

It can be divided in two parts, 31215 and 68641, that added together give a square (99856 = 316²).

The spelling of 3121568641 in words is "three billion, one hundred twenty-one million, five hundred sixty-eight thousand, six hundred forty-one".