231201032111 has 4 divisors (see below), whose sum is σ = 264229750992. Its totient is φ = 198172313232.

The previous prime is 231201032093. The next prime is 231201032119. The reversal of 231201032111 is 111230102132.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231201032111 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231201032111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231201032119) 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, 16514359430 + ... + 16514359443.

It is an arithmetic number, because the mean of its divisors is an integer number (66057437748).

Almost surely, 2^231201032111 is an apocalyptic number.

231201032111 is a deficient number, since it is larger than the sum of its proper divisors (33028718881).

231201032111 is an equidigital number, since it uses as much as digits as its factorization.

231201032111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33028718880.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 231201032111 its reverse (111230102132), we get a palindrome (342431134243).

The spelling of 231201032111 in words is "two hundred thirty-one billion, two hundred one million, thirty-two thousand, one hundred eleven".