231513450031481 has 2 divisors, whose sum is σ = 231513450031482. Its totient is φ = 231513450031480.

The previous prime is 231513450031459. The next prime is 231513450031559. The reversal of 231513450031481 is 184130054315132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185504835840256 + 46008614191225 = 13620016^2 + 6782965^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231513450031481 is a prime.

It is a super-2 number, since 2×231513450031481² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (231513450031081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115756725015740 + 115756725015741.

It is an arithmetic number, because the mean of its divisors is an integer number (115756725015741).

Almost surely, 2^{231513450031481} is an apocalyptic number.

It is an amenable number.

231513450031481 is a deficient number, since it is larger than the sum of its proper divisors (1).

231513450031481 is an equidigital number, since it uses as much as digits as its factorization.

231513450031481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172800, while the sum is 41.

The spelling of 231513450031481 in words is "two hundred thirty-one trillion, five hundred thirteen billion, four hundred fifty million, thirty-one thousand, four hundred eighty-one".