231200111 has 4 divisors (see below), whose sum is σ = 231231000. Its totient is φ = 231169224.

The previous prime is 231200089. The next prime is 231200129. The reversal of 231200111 is 111002132.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 231200111 - 2¹⁴ = 231183727 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231200092 and 231200101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231200131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3665 + ... + 21813.

It is an arithmetic number, because the mean of its divisors is an integer number (57807750).

Almost surely, 2^231200111 is an apocalyptic number.

231200111 is a deficient number, since it is larger than the sum of its proper divisors (30889).

231200111 is a wasteful number, since it uses less digits than its factorization.

231200111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30888.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 231200111 is about 15205.2658970503. The cubic root of 231200111 is about 613.7563702548.

Adding to 231200111 its reverse (111002132), we get a palindrome (342202243).

The spelling of 231200111 in words is "two hundred thirty-one million, two hundred thousand, one hundred eleven".