31124251331 has 2 divisors, whose sum is σ = 31124251332. Its totient is φ = 31124251330.

The previous prime is 31124251289. The next prime is 31124251339. The reversal of 31124251331 is 13315242113.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31124251331 is a prime.

It is a super-2 number, since 2×31124251331² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31124251331.

It is not a weakly prime, because it can be changed into another prime (31124251339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15562125665 + 15562125666.

It is an arithmetic number, because the mean of its divisors is an integer number (15562125666).

Almost surely, 2^31124251331 is an apocalyptic number.

31124251331 is a deficient number, since it is larger than the sum of its proper divisors (1).

31124251331 is an equidigital number, since it uses as much as digits as its factorization.

31124251331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 26.

Adding to 31124251331 its reverse (13315242113), we get a palindrome (44439493444).

The spelling of 31124251331 in words is "thirty-one billion, one hundred twenty-four million, two hundred fifty-one thousand, three hundred thirty-one".