111381 has 8 divisors (see below), whose sum is σ = 150144. Its totient is φ = 73440.

The previous prime is 111373. The next prime is 111409. The reversal of 111381 is 183111.

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

It is not a de Polignac number, because 111381 - 2³ = 111373 is a prime.

It is a super-2 number, since 2×111381² = 24811454322, which contains 22 as substring.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 111381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111301) 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, 276 + ... + 546.

It is an arithmetic number, because the mean of its divisors is an integer number (18768).

2¹¹¹³⁸¹ is an apocalyptic number.

It is an amenable number.

111381 is a deficient number, since it is larger than the sum of its proper divisors (38763).

111381 is a wasteful number, since it uses less digits than its factorization.

111381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411.

The product of its digits is 24, while the sum is 15.

The square root of 111381 is about 333.7379211297. The cubic root of 111381 is about 48.1138789167.

Adding to 111381 its reverse (183111), we get a palindrome (294492).

The spelling of 111381 in words is "one hundred eleven thousand, three hundred eighty-one".