231515443120113 has 6 divisors (see below), whose sum is σ = 334411195617954. Its totient is φ = 154343628746736.

The previous prime is 231515443120079. The next prime is 231515443120127. The reversal of 231515443120113 is 311021344515132.

231515443120113 is a `hidden beast` number, since 2 + 3 + 1 + 5 + 1 + 5 + 4 + 431 + 201 + 13 = 666.

It can be written as a sum of positive squares in only one way, i.e., 177037714024704 + 54477729095409 = 13305552^2 + 7380903^2 .

It is not a de Polignac number, because 231515443120113 - 2²² = 231515438925809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231515443120183) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12861969062220 + ... + 12861969062237.

It is an arithmetic number, because the mean of its divisors is an integer number (55735199269659).

Almost surely, 2^{231515443120113} is an apocalyptic number.

It is an amenable number.

231515443120113 is a deficient number, since it is larger than the sum of its proper divisors (102895752497841).

231515443120113 is a wasteful number, since it uses less digits than its factorization.

231515443120113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25723938124463 (or 25723938124460 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

Adding to 231515443120113 its reverse (311021344515132), we get a palindrome (542536787635245).

The spelling of 231515443120113 in words is "two hundred thirty-one trillion, five hundred fifteen billion, four hundred forty-three million, one hundred twenty thousand, one hundred thirteen".