231515443112013 has 6 divisors (see below), whose sum is σ = 334411195606254. Its totient is φ = 154343628741336.

The previous prime is 231515443111999. The next prime is 231515443112027. The reversal of 231515443112013 is 310211344515132.

231515443112013 is a `hidden beast` number, since 2 + 3 + 1 + 5 + 1 + 5 + 443 + 1 + 1 + 201 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (231515443111999) and next prime (231515443112027).

It can be written as a sum of positive squares in only one way, i.e., 125544024757449 + 105971418354564 = 11204643^2 + 10294242^2 .

It is not a de Polignac number, because 231515443112013 - 2¹³ = 231515443103821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231515443114013) 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, 12861969061770 + ... + 12861969061787.

It is an arithmetic number, because the mean of its divisors is an integer number (55735199267709).

Almost surely, 2^{231515443112013} is an apocalyptic number.

It is an amenable number.

231515443112013 is a deficient number, since it is larger than the sum of its proper divisors (102895752494241).

231515443112013 is a wasteful number, since it uses less digits than its factorization.

231515443112013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25723938123563 (or 25723938123560 counting only the distinct ones).

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

Adding to 231515443112013 its reverse (310211344515132), we get a palindrome (541726787627145).

The spelling of 231515443112013 in words is "two hundred thirty-one trillion, five hundred fifteen billion, four hundred forty-three million, one hundred twelve thousand, thirteen".