31123441121 has 2 divisors, whose sum is σ = 31123441122. Its totient is φ = 31123441120.

The previous prime is 31123441051. The next prime is 31123441123. The reversal of 31123441121 is 12114432113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21110637025 + 10012804096 = 145295^2 + 100064^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31123441121 is a prime.

Together with 31123441123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31123441123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15561720560 + 15561720561.

It is an arithmetic number, because the mean of its divisors is an integer number (15561720561).

Almost surely, 2^31123441121 is an apocalyptic number.

It is an amenable number.

31123441121 is a deficient number, since it is larger than the sum of its proper divisors (1).

31123441121 is an equidigital number, since it uses as much as digits as its factorization.

31123441121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 23.

Adding to 31123441121 its reverse (12114432113), we get a palindrome (43237873234).

The spelling of 31123441121 in words is "thirty-one billion, one hundred twenty-three million, four hundred forty-one thousand, one hundred twenty-one".