111997 has 2 divisors, whose sum is σ = 111998.
Its totient is φ = 111996.
The previous prime is 111977. The next prime is 112019. The reversal of 111997 is 799111.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 111556 + 441 = 334^2 + 21^2
It is a cyclic number.
It is not a de Polignac number, because 111997 - 27 = 111869 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (111977) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55998 + 55999.
It is an arithmetic number, because the mean of its divisors is an integer number (55999).
2111997 is an apocalyptic number.
It is an amenable number.
111997 is a deficient number, since it is larger than the sum of its proper divisors (1).
111997 is an equidigital number, since it uses as much as digits as its factorization.
111997 is an evil number, because the sum of its binary digits is even.
The product of its digits is 567, while the sum is 28.
The square root of 111997 is about 334.6595284763.
The cubic root of 111997 is about 48.2024148971.
The spelling of 111997 in words is "one hundred eleven thousand, nine hundred ninety-seven".