87317999 has 4 divisors (see below), whose sum is σ = 87337320. Its totient is φ = 87298680.

The previous prime is 87317983. The next prime is 87318013. The reversal of 87317999 is 99971378.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 87317999 - 2⁴ = 87317983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87317999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87317969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1157 + ... + 13265.

It is an arithmetic number, because the mean of its divisors is an integer number (21834330).

Almost surely, 2^87317999 is an apocalyptic number.

87317999 is a deficient number, since it is larger than the sum of its proper divisors (19321).

87317999 is a wasteful number, since it uses less digits than its factorization.

87317999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19320.

The product of its digits is 857304, while the sum is 53.

The square root of 87317999 is about 9344.4100402326. The cubic root of 87317999 is about 443.6439787975.

The spelling of 87317999 in words is "eighty-seven million, three hundred seventeen thousand, nine hundred ninety-nine".