31155231113 has 2 divisors, whose sum is σ = 31155231114. Its totient is φ = 31155231112.

The previous prime is 31155231059. The next prime is 31155231127. The reversal of 31155231113 is 31113255113.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26079666064 + 5075565049 = 161492^2 + 71243^2 .

It is a cyclic number.

It is not a de Polignac number, because 31155231113 - 2¹⁰ = 31155230089 is a prime.

It is not a weakly prime, because it can be changed into another prime (31155234113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15577615556 + 15577615557.

It is an arithmetic number, because the mean of its divisors is an integer number (15577615557).

Almost surely, 2^31155231113 is an apocalyptic number.

It is an amenable number.

31155231113 is a deficient number, since it is larger than the sum of its proper divisors (1).

31155231113 is an equidigital number, since it uses as much as digits as its factorization.

31155231113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1350, while the sum is 26.

Adding to 31155231113 its reverse (31113255113), we get a palindrome (62268486226).

The spelling of 31155231113 in words is "thirty-one billion, one hundred fifty-five million, two hundred thirty-one thousand, one hundred thirteen".