102159987 has 16 divisors (see below), whose sum is σ = 147746592. Its totient is φ = 62535680.

The previous prime is 102159961. The next prime is 102160001. The reversal of 102159987 is 789951201.

It is a cyclic number.

It is not a de Polignac number, because 102159987 - 2⁸ = 102159731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (102159917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22338 + ... + 26519.

It is an arithmetic number, because the mean of its divisors is an integer number (9234162).

Almost surely, 2^102159987 is an apocalyptic number.

102159987 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

102159987 is a deficient number, since it is larger than the sum of its proper divisors (45586605).

102159987 is a wasteful number, since it uses less digits than its factorization.

102159987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48918.

The product of its (nonzero) digits is 45360, while the sum is 42.

The square root of 102159987 is about 10107.4223717029. The cubic root of 102159987 is about 467.4770301468.

It can be divided in two parts, 10215 and 9987, that added together give a palindrome (20202).

The spelling of 102159987 in words is "one hundred two million, one hundred fifty-nine thousand, nine hundred eighty-seven".