111311110312031 has 4 divisors (see below), whose sum is σ = 127212697499472. Its totient is φ = 95409523124592.

The previous prime is 111311110312013. The next prime is 111311110312121. The reversal of 111311110312031 is 130213011113111.

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-111311110312031 is a prime.

It is a super-2 number, since 2×111311110312031² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111311110311994 and 111311110312012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111311110312631) 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, 7950793593710 + ... + 7950793593723.

It is an arithmetic number, because the mean of its divisors is an integer number (31803174374868).

Almost surely, 2^{111311110312031} is an apocalyptic number.

111311110312031 is a deficient number, since it is larger than the sum of its proper divisors (15901587187441).

111311110312031 is an equidigital number, since it uses as much as digits as its factorization.

111311110312031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15901587187440.

The product of its (nonzero) digits is 54, while the sum is 20.

Adding to 111311110312031 its reverse (130213011113111), we get a palindrome (241524121425142).

The spelling of 111311110312031 in words is "one hundred eleven trillion, three hundred eleven billion, one hundred ten million, three hundred twelve thousand, thirty-one".