31324440131 has 2 divisors, whose sum is σ = 31324440132. Its totient is φ = 31324440130.

The previous prime is 31324440127. The next prime is 31324440221. The reversal of 31324440131 is 13104442313.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (13104442313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31324440131 - 2² = 31324440127 is a prime.

It is a super-2 number, since 2×31324440131² (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 31324440131.

It is not a weakly prime, because it can be changed into another prime (31324440101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15662220065 + 15662220066.

It is an arithmetic number, because the mean of its divisors is an integer number (15662220066).

Almost surely, 2^31324440131 is an apocalyptic number.

31324440131 is a deficient number, since it is larger than the sum of its proper divisors (1).

31324440131 is an equidigital number, since it uses as much as digits as its factorization.

31324440131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 26.

Adding to 31324440131 its reverse (13104442313), we get a palindrome (44428882444).

The spelling of 31324440131 in words is "thirty-one billion, three hundred twenty-four million, four hundred forty thousand, one hundred thirty-one".