10171987 has 4 divisors (see below), whose sum is σ = 11625136.
Its totient is φ = 8718840.
The previous prime is 10171963. The next prime is 10171991. The reversal of 10171987 is 78917101.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-10171987 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (10171087) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 726564 + ... + 726577.
It is an arithmetic number, because the mean of its divisors is an integer number (2906284).
Almost surely, 210171987 is an apocalyptic number.
10171987 is a deficient number, since it is larger than the sum of its proper divisors (1453149).
10171987 is an equidigital number, since it uses as much as digits as its factorization.
10171987 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1453148.
The product of its (nonzero) digits is 3528, while the sum is 34.
The square root of 10171987 is about 3189.3552639993.
The cubic root of 10171987 is about 216.6715709607.
The spelling of 10171987 in words is "ten million, one hundred seventy-one thousand, nine hundred eighty-seven".