111231232013 has 4 divisors (see below), whose sum is σ = 121343162208. Its totient is φ = 101119301820.

The previous prime is 111231232009. The next prime is 111231232019. The reversal of 111231232013 is 310232132111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 111231232013 - 2² = 111231232009 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 (111231232019) 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, 5055965081 + ... + 5055965102.

It is an arithmetic number, because the mean of its divisors is an integer number (30335790552).

Almost surely, 2^111231232013 is an apocalyptic number.

It is an amenable number.

111231232013 is a deficient number, since it is larger than the sum of its proper divisors (10111930195).

111231232013 is a wasteful number, since it uses less digits than its factorization.

111231232013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10111930194.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 111231232013 its reverse (310232132111), we get a palindrome (421463364124).

The spelling of 111231232013 in words is "one hundred eleven billion, two hundred thirty-one million, two hundred thirty-two thousand, thirteen".