3131120557 has 2 divisors, whose sum is σ = 3131120558. Its totient is φ = 3131120556.

The previous prime is 3131120471. The next prime is 3131120569. The reversal of 3131120557 is 7550211313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2764551241 + 366569316 = 52579^2 + 19146^2 .

It is a cyclic number.

It is not a de Polignac number, because 3131120557 - 2¹⁵ = 3131087789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3131127557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1565560278 + 1565560279.

It is an arithmetic number, because the mean of its divisors is an integer number (1565560279).

Almost surely, 2^3131120557 is an apocalyptic number.

It is an amenable number.

3131120557 is a deficient number, since it is larger than the sum of its proper divisors (1).

3131120557 is an equidigital number, since it uses as much as digits as its factorization.

3131120557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3150, while the sum is 28.

The square root of 3131120557 is about 55956.4165846956. The cubic root of 3131120557 is about 1462.9627328908.

The spelling of 3131120557 in words is "three billion, one hundred thirty-one million, one hundred twenty thousand, five hundred fifty-seven".