111320431 has 4 divisors (see below), whose sum is σ = 111342112. Its totient is φ = 111298752.

The previous prime is 111320423. The next prime is 111320467. The reversal of 111320431 is 134023111.

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 111320431 - 2³ = 111320423 is a prime.

It is a super-2 number, since 2×111320431² = 24784476716051522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111320491) 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, 1690 + ... + 15016.

It is an arithmetic number, because the mean of its divisors is an integer number (27835528).

Almost surely, 2^111320431 is an apocalyptic number.

111320431 is a deficient number, since it is larger than the sum of its proper divisors (21681).

111320431 is an equidigital number, since it uses as much as digits as its factorization.

111320431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21680.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 111320431 is about 10550.8497762029. The cubic root of 111320431 is about 481.0515589114.

Adding to 111320431 its reverse (134023111), we get a palindrome (245343542).

The spelling of 111320431 in words is "one hundred eleven million, three hundred twenty thousand, four hundred thirty-one".