111631 has 8 divisors (see below), whose sum is σ = 124544. Its totient is φ = 99360.

The previous prime is 111623. The next prime is 111637. The reversal of 111631 is 136111.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 111631 - 2³ = 111623 is a prime.

It is a super-2 number, since 2×111631² = 24922960322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111637) 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, 265 + ... + 541.

It is an arithmetic number, because the mean of its divisors is an integer number (15568).

2¹¹¹⁶³¹ is an apocalyptic number.

111631 is a deficient number, since it is larger than the sum of its proper divisors (12913).

111631 is a wasteful number, since it uses less digits than its factorization.

111631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321.

The product of its digits is 18, while the sum is 13.

The square root of 111631 is about 334.1122565845. The cubic root of 111631 is about 48.1498499873.

Adding to 111631 its reverse (136111), we get a palindrome (247742).

It can be divided in two parts, 1116 and 31, that multiplied together give a square (34596 = 186²).

The spelling of 111631 in words is "one hundred eleven thousand, six hundred thirty-one".