31023231111013 has 2 divisors, whose sum is σ = 31023231111014. Its totient is φ = 31023231111012.

The previous prime is 31023231111001. The next prime is 31023231111023. The reversal of 31023231111013 is 31011113232013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30115323234049 + 907907876964 = 5487743^2 + 952842^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31023231111013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31023231111023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15511615555506 + 15511615555507.

It is an arithmetic number, because the mean of its divisors is an integer number (15511615555507).

Almost surely, 2^{31023231111013} is an apocalyptic number.

It is an amenable number.

31023231111013 is a deficient number, since it is larger than the sum of its proper divisors (1).

31023231111013 is an equidigital number, since it uses as much as digits as its factorization.

31023231111013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 31023231111013 its reverse (31011113232013), we get a palindrome (62034344343026).

The spelling of 31023231111013 in words is "thirty-one trillion, twenty-three billion, two hundred thirty-one million, one hundred eleven thousand, thirteen".