231111121103201 has 4 divisors (see below), whose sum is σ = 234277026871812. Its totient is φ = 227945215334592.

The previous prime is 231111121103189. The next prime is 231111121103249. The reversal of 231111121103201 is 102301121111132.

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

It can be written as a sum of positive squares in 2 ways, for example, as 148366991998801 + 82744129104400 = 12180599^2 + 9096380^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231111121103201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231111121103701) 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, 1582952884196 + ... + 1582952884341.

It is an arithmetic number, because the mean of its divisors is an integer number (58569256717953).

Almost surely, 2^{231111121103201} is an apocalyptic number.

It is an amenable number.

231111121103201 is a deficient number, since it is larger than the sum of its proper divisors (3165905768611).

231111121103201 is an equidigital number, since it uses as much as digits as its factorization.

231111121103201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3165905768610.

The product of its (nonzero) digits is 72, while the sum is 20.

Adding to 231111121103201 its reverse (102301121111132), we get a palindrome (333412242214333).

The spelling of 231111121103201 in words is "two hundred thirty-one trillion, one hundred eleven billion, one hundred twenty-one million, one hundred three thousand, two hundred one".