101987 has 2 divisors, whose sum is σ = 101988. Its totient is φ = 101986.

The previous prime is 101977. The next prime is 101999. The reversal of 101987 is 789101.

It is a weak prime.

It is an emirp because it is prime and its reverse (789101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 101987 - 2¹⁶ = 36451 is a prime.

It is a Chen prime.

It is a zygodrome in base 2.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 101987.

It is not a weakly prime, because it can be changed into another prime (101917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50993 + 50994.

It is an arithmetic number, because the mean of its divisors is an integer number (50994).

2¹⁰¹⁹⁸⁷ is an apocalyptic number.

101987 is a deficient number, since it is larger than the sum of its proper divisors (1).

101987 is an equidigital number, since it uses as much as digits as its factorization.

101987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 26.

The square root of 101987 is about 319.3540355154. The cubic root of 101987 is about 46.7213022230.

The spelling of 101987 in words is "one hundred one thousand, nine hundred eighty-seven".