231111612 has 18 divisors (see below), whose sum is σ = 584198888. Its totient is φ = 77037192.

The previous prime is 231111607. The next prime is 231111623. The reversal of 231111612 is 216111132.

231111612 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3209848 + ... + 3209919.

Almost surely, 2^231111612 is an apocalyptic number.

It is an amenable number.

231111612 is an abundant number, since it is smaller than the sum of its proper divisors (353087276).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231111612 is a wasteful number, since it uses less digits than its factorization.

231111612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6419777 (or 6419772 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

The square root of 231111612 is about 15202.3554753860. The cubic root of 231111612 is about 613.6780488435.

Adding to 231111612 its reverse (216111132), we get a palindrome (447222744).

The spelling of 231111612 in words is "two hundred thirty-one million, one hundred eleven thousand, six hundred twelve".