3131870561 has 2 divisors, whose sum is σ = 3131870562. Its totient is φ = 3131870560.

The previous prime is 3131870537. The next prime is 3131870593. The reversal of 3131870561 is 1650781313.

3131870561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3069160000 + 62710561 = 55400^2 + 7919^2 .

It is a cyclic number.

It is not a de Polignac number, because 3131870561 - 2¹⁰ = 3131869537 is a prime.

It is a super-2 number, since 2×3131870561² = 19617226421716909442, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (3131870501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1565935280 + 1565935281.

It is an arithmetic number, because the mean of its divisors is an integer number (1565935281).

Almost surely, 2^3131870561 is an apocalyptic number.

It is an amenable number.

3131870561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3131870561 is an equidigital number, since it uses as much as digits as its factorization.

3131870561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 3131870561 is about 55963.1178634643. The cubic root of 3131870561 is about 1463.0795324291.

The spelling of 3131870561 in words is "three billion, one hundred thirty-one million, eight hundred seventy thousand, five hundred sixty-one".