31241979557 has 2 divisors, whose sum is σ = 31241979558. Its totient is φ = 31241979556.

The previous prime is 31241979529. The next prime is 31241979581. The reversal of 31241979557 is 75597914213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21588131041 + 9653848516 = 146929^2 + 98254^2 .

It is a cyclic number.

It is not a de Polignac number, because 31241979557 - 2⁶ = 31241979493 is a prime.

It is a super-2 number, since 2×31241979557² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31241979499 and 31241979508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31241979157) 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, 15620989778 + 15620989779.

It is an arithmetic number, because the mean of its divisors is an integer number (15620989779).

Almost surely, 2^31241979557 is an apocalyptic number.

It is an amenable number.

31241979557 is a deficient number, since it is larger than the sum of its proper divisors (1).

31241979557 is an equidigital number, since it uses as much as digits as its factorization.

31241979557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2381400, while the sum is 53.

The spelling of 31241979557 in words is "thirty-one billion, two hundred forty-one million, nine hundred seventy-nine thousand, five hundred fifty-seven".