231385111 has 4 divisors (see below), whose sum is σ = 231523000. Its totient is φ = 231247224.

The previous prime is 231385093. The next prime is 231385117. The reversal of 231385111 is 111583132.

231385111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 231385111 - 2²⁷ = 97167383 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 (231385117) 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, 66396 + ... + 69793.

It is an arithmetic number, because the mean of its divisors is an integer number (57880750).

Almost surely, 2^231385111 is an apocalyptic number.

231385111 is a deficient number, since it is larger than the sum of its proper divisors (137889).

231385111 is a wasteful number, since it uses less digits than its factorization.

231385111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137888.

The product of its digits is 720, while the sum is 25.

The square root of 231385111 is about 15211.3480993632. The cubic root of 231385111 is about 613.9200302927.

The spelling of 231385111 in words is "two hundred thirty-one million, three hundred eighty-five thousand, one hundred eleven".