231121131013 has 2 divisors, whose sum is σ = 231121131014. Its totient is φ = 231121131012.

The previous prime is 231121130993. The next prime is 231121131029. The reversal of 231121131013 is 310131121132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173416443489 + 57704687524 = 416433^2 + 240218^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231121131013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231121131613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115560565506 + 115560565507.

It is an arithmetic number, because the mean of its divisors is an integer number (115560565507).

Almost surely, 2^231121131013 is an apocalyptic number.

It is an amenable number.

231121131013 is a deficient number, since it is larger than the sum of its proper divisors (1).

231121131013 is an equidigital number, since it uses as much as digits as its factorization.

231121131013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 231121131013 its reverse (310131121132), we get a palindrome (541252252145).

The spelling of 231121131013 in words is "two hundred thirty-one billion, one hundred twenty-one million, one hundred thirty-one thousand, thirteen".