111869 has 2 divisors, whose sum is σ = 111870. Its totient is φ = 111868.

The previous prime is 111863. The next prime is 111871. The reversal of 111869 is 968111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56644 + 55225 = 238^2 + 235^2 .

It is an emirp because it is prime and its reverse (968111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111869 - 2¹² = 107773 is a prime.

It is a super-2 number, since 2×111869² = 25029346322, which contains 22 as substring.

Together with 111871, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55934 + 55935.

It is an arithmetic number, because the mean of its divisors is an integer number (55935).

2¹¹¹⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

111869 is a deficient number, since it is larger than the sum of its proper divisors (1).

111869 is an equidigital number, since it uses as much as digits as its factorization.

111869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 26.

The square root of 111869 is about 334.4682346651. The cubic root of 111869 is about 48.1840445803.

The spelling of 111869 in words is "one hundred eleven thousand, eight hundred sixty-nine".