123201031111 has 4 divisors (see below), whose sum is σ = 123206776792. Its totient is φ = 123195285432.

The previous prime is 123201031103. The next prime is 123201031139. The reversal of 123201031111 is 111130102321.

It is a happy number.

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 123201031111 - 2³ = 123201031103 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 (123201031411) 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, 2840556 + ... + 2883601.

It is an arithmetic number, because the mean of its divisors is an integer number (30801694198).

Almost surely, 2^123201031111 is an apocalyptic number.

123201031111 is a deficient number, since it is larger than the sum of its proper divisors (5745681).

123201031111 is an equidigital number, since it uses as much as digits as its factorization.

123201031111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5745680.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 123201031111 its reverse (111130102321), we get a palindrome (234331133432).

The spelling of 123201031111 in words is "one hundred twenty-three billion, two hundred one million, thirty-one thousand, one hundred eleven".