231513450031993 has 2 divisors, whose sum is σ = 231513450031994. Its totient is φ = 231513450031992.

The previous prime is 231513450031967. The next prime is 231513450032017. The reversal of 231513450031993 is 399130054315132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223416306611689 + 8097143420304 = 14947117^2 + 2845548^2 .

It is a cyclic number.

It is not a de Polignac number, because 231513450031993 - 2⁹ = 231513450031481 is a prime.

It is a super-2 number, since 2×231513450031993² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (231513450031093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115756725015996 + 115756725015997.

It is an arithmetic number, because the mean of its divisors is an integer number (115756725015997).

Almost surely, 2^{231513450031993} is an apocalyptic number.

It is an amenable number.

231513450031993 is a deficient number, since it is larger than the sum of its proper divisors (1).

231513450031993 is an equidigital number, since it uses as much as digits as its factorization.

231513450031993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1312200, while the sum is 49.

The spelling of 231513450031993 in words is "two hundred thirty-one trillion, five hundred thirteen billion, four hundred fifty million, thirty-one thousand, nine hundred ninety-three".