231515520112111 has 4 divisors (see below), whose sum is σ = 231526762570432. Its totient is φ = 231504277653792.

The previous prime is 231515520112109. The next prime is 231515520112189. The reversal of 231515520112111 is 111211025515132.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 231515520112111 - 2¹ = 231515520112109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231515520112511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5621198271 + ... + 5621239456.

It is an arithmetic number, because the mean of its divisors is an integer number (57881690642608).

Almost surely, 2^{231515520112111} is an apocalyptic number.

231515520112111 is a deficient number, since it is larger than the sum of its proper divisors (11242458321).

231515520112111 is a wasteful number, since it uses less digits than its factorization.

231515520112111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11242458320.

The product of its (nonzero) digits is 3000, while the sum is 31.

Adding to 231515520112111 its reverse (111211025515132), we get a palindrome (342726545627243).

The spelling of 231515520112111 in words is "two hundred thirty-one trillion, five hundred fifteen billion, five hundred twenty million, one hundred twelve thousand, one hundred eleven".