109987 has 2 divisors, whose sum is σ = 109988. Its totient is φ = 109986.

The previous prime is 109961. The next prime is 110017. The reversal of 109987 is 789901.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 109987 - 2⁷ = 109859 is a prime.

It is not a weakly prime, because it can be changed into another prime (109937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54993 + 54994.

It is an arithmetic number, because the mean of its divisors is an integer number (54994).

2¹⁰⁹⁹⁸⁷ is an apocalyptic number.

109987 is a deficient number, since it is larger than the sum of its proper divisors (1).

109987 is an equidigital number, since it uses as much as digits as its factorization.

109987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 109987 is about 331.6428802191. The cubic root of 109987 is about 47.9123109672.

The spelling of 109987 in words is "one hundred nine thousand, nine hundred eighty-seven".