231020111 has 4 divisors (see below), whose sum is σ = 264022992. Its totient is φ = 198017232.

The previous prime is 231020099. The next prime is 231020113. The reversal of 231020111 is 111020132.

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

It is not a de Polignac number, because 231020111 - 2⁶ = 231020047 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231020092 and 231020101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231020113) 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, 16501430 + ... + 16501443.

It is an arithmetic number, because the mean of its divisors is an integer number (66005748).

Almost surely, 2^231020111 is an apocalyptic number.

231020111 is a deficient number, since it is larger than the sum of its proper divisors (33002881).

231020111 is an equidigital number, since it uses as much as digits as its factorization.

231020111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33002880.

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

The square root of 231020111 is about 15199.3457424983. The cubic root of 231020111 is about 613.5970496431.

Adding to 231020111 its reverse (111020132), we get a palindrome (342040243).

The spelling of 231020111 in words is "two hundred thirty-one million, twenty thousand, one hundred eleven".