31331243113 has 2 divisors, whose sum is σ = 31331243114. Its totient is φ = 31331243112.

The previous prime is 31331243107. The next prime is 31331243173. The reversal of 31331243113 is 31134213313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28651317289 + 2679925824 = 169267^2 + 51768^2 .

It is a cyclic number.

It is not a de Polignac number, because 31331243113 - 2⁵ = 31331243081 is a prime.

It is not a weakly prime, because it can be changed into another prime (31331243173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15665621556 + 15665621557.

It is an arithmetic number, because the mean of its divisors is an integer number (15665621557).

Almost surely, 2^31331243113 is an apocalyptic number.

It is an amenable number.

31331243113 is a deficient number, since it is larger than the sum of its proper divisors (1).

31331243113 is an equidigital number, since it uses as much as digits as its factorization.

31331243113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 25.

Adding to 31331243113 its reverse (31134213313), we get a palindrome (62465456426).

The spelling of 31331243113 in words is "thirty-one billion, three hundred thirty-one million, two hundred forty-three thousand, one hundred thirteen".