111731 has 2 divisors, whose sum is σ = 111732. Its totient is φ = 111730.

The previous prime is 111721. The next prime is 111733. The reversal of 111731 is 137111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111731 - 2⁶ = 111667 is a prime.

It is a super-2 number, since 2×111731² = 24967632722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 111733, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55865 + 55866.

It is an arithmetic number, because the mean of its divisors is an integer number (55866).

2¹¹¹⁷³¹ is an apocalyptic number.

111731 is a deficient number, since it is larger than the sum of its proper divisors (1).

111731 is an equidigital number, since it uses as much as digits as its factorization.

111731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21, while the sum is 14.

The square root of 111731 is about 334.2618733867. The cubic root of 111731 is about 48.1642233781.

Adding to 111731 its reverse (137111), we get a palindrome (248842).

The spelling of 111731 in words is "one hundred eleven thousand, seven hundred thirty-one".