31113312211181 has 2 divisors, whose sum is σ = 31113312211182. Its totient is φ = 31113312211180.

The previous prime is 31113312211171. The next prime is 31113312211213. The reversal of 31113312211181 is 18111221331113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21682480038025 + 9430832173156 = 4656445^2 + 3070966^2 .

It is a cyclic number.

It is not a de Polignac number, because 31113312211181 - 2²² = 31113308016877 is a prime.

It is a super-2 number, since 2×31113312211181² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31113312211151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15556656105590 + 15556656105591.

It is an arithmetic number, because the mean of its divisors is an integer number (15556656105591).

Almost surely, 2^{31113312211181} is an apocalyptic number.

It is an amenable number.

31113312211181 is a deficient number, since it is larger than the sum of its proper divisors (1).

31113312211181 is an equidigital number, since it uses as much as digits as its factorization.

31113312211181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 29.

Adding to 31113312211181 its reverse (18111221331113), we get a palindrome (49224533542294).

The spelling of 31113312211181 in words is "thirty-one trillion, one hundred thirteen billion, three hundred twelve million, two hundred eleven thousand, one hundred eighty-one".