115987 has 2 divisors, whose sum is σ = 115988. Its totient is φ = 115986.

The previous prime is 115981. The next prime is 116009. The reversal of 115987 is 789511.

It is a weak prime.

It is an emirp because it is prime and its reverse (789511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 115987 - 2³ = 115979 is a prime.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (115981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57993 + 57994.

It is an arithmetic number, because the mean of its divisors is an integer number (57994).

2¹¹⁵⁹⁸⁷ is an apocalyptic number.

115987 is a deficient number, since it is larger than the sum of its proper divisors (1).

115987 is an equidigital number, since it uses as much as digits as its factorization.

115987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 31.

The square root of 115987 is about 340.5686421267. The cubic root of 115987 is about 48.7681676752.

The spelling of 115987 in words is "one hundred fifteen thousand, nine hundred eighty-seven".