231305505113 has 2 divisors, whose sum is σ = 231305505114. Its totient is φ = 231305505112.

The previous prime is 231305505073. The next prime is 231305505131. The reversal of 231305505113 is 311505503132.

It is a happy number.

Together with next prime (231305505131) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189792665104 + 41512840009 = 435652^2 + 203747^2 .

It is a cyclic number.

It is not a de Polignac number, because 231305505113 - 2⁶ = 231305505049 is a prime.

It is not a weakly prime, because it can be changed into another prime (231305505163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115652752556 + 115652752557.

It is an arithmetic number, because the mean of its divisors is an integer number (115652752557).

Almost surely, 2^231305505113 is an apocalyptic number.

It is an amenable number.

231305505113 is a deficient number, since it is larger than the sum of its proper divisors (1).

231305505113 is an equidigital number, since it uses as much as digits as its factorization.

231305505113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6750, while the sum is 29.

The spelling of 231305505113 in words is "two hundred thirty-one billion, three hundred five million, five hundred five thousand, one hundred thirteen".