231323220113 has 2 divisors, whose sum is σ = 231323220114. Its totient is φ = 231323220112.

The previous prime is 231323220101. The next prime is 231323220173. The reversal of 231323220113 is 311022323132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 184081328209 + 47241891904 = 429047^2 + 217352^2 .

It is a cyclic number.

It is not a de Polignac number, because 231323220113 - 2¹⁰ = 231323219089 is a prime.

It is not a weakly prime, because it can be changed into another prime (231323220173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115661610056 + 115661610057.

It is an arithmetic number, because the mean of its divisors is an integer number (115661610057).

Almost surely, 2^231323220113 is an apocalyptic number.

It is an amenable number.

231323220113 is a deficient number, since it is larger than the sum of its proper divisors (1).

231323220113 is an equidigital number, since it uses as much as digits as its factorization.

231323220113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 231323220113 its reverse (311022323132), we get a palindrome (542345543245).

The spelling of 231323220113 in words is "two hundred thirty-one billion, three hundred twenty-three million, two hundred twenty thousand, one hundred thirteen".