111321431 has 4 divisors (see below), whose sum is σ = 119884632. Its totient is φ = 102758232.

The previous prime is 111321421. The next prime is 111321433. The reversal of 111321431 is 134123111.

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 111321431 - 2¹⁸ = 111059287 is a prime.

It is a super-2 number, since 2×111321431² = 24784921999775522, 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 (111321433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4281581 + ... + 4281606.

It is an arithmetic number, because the mean of its divisors is an integer number (29971158).

Almost surely, 2^111321431 is an apocalyptic number.

111321431 is a deficient number, since it is larger than the sum of its proper divisors (8563201).

111321431 is an equidigital number, since it uses as much as digits as its factorization.

111321431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8563200.

The product of its digits is 72, while the sum is 17.

The square root of 111321431 is about 10550.8971656443. The cubic root of 111321431 is about 481.0529993482.

Adding to 111321431 its reverse (134123111), we get a palindrome (245444542).

The spelling of 111321431 in words is "one hundred eleven million, three hundred twenty-one thousand, four hundred thirty-one".