111331 has 8 divisors (see below), whose sum is σ = 126000. Its totient is φ = 97440.

The previous prime is 111323. The next prime is 111337. The reversal of 111331 is 133111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 111331 - 2³ = 111323 is a prime.

It is a super-2 number, since 2×111331² = 24789183122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111337) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145 + ... + 493.

It is an arithmetic number, because the mean of its divisors is an integer number (15750).

2¹¹¹³³¹ is an apocalyptic number.

111331 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111331 is a deficient number, since it is larger than the sum of its proper divisors (14669).

111331 is a wasteful number, since it uses less digits than its factorization.

111331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389.

The product of its digits is 9, while the sum is 10.

The square root of 111331 is about 333.6630036429. The cubic root of 111331 is about 48.1066782451.

Adding to 111331 its reverse (133111), we get a palindrome (244442).

It can be divided in two parts, 11 and 1331, that multiplied together give a palindrome (14641).

The spelling of 111331 in words is "one hundred eleven thousand, three hundred thirty-one".