171291887 has 4 divisors (see below), whose sum is σ = 184468200. Its totient is φ = 158115576.

The previous prime is 171291877. The next prime is 171291917. The reversal of 171291887 is 788192171.

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 171291887 - 2¹⁰ = 171290863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171291877) 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, 6588137 + ... + 6588162.

It is an arithmetic number, because the mean of its divisors is an integer number (46117050).

Almost surely, 2^171291887 is an apocalyptic number.

171291887 is a deficient number, since it is larger than the sum of its proper divisors (13176313).

171291887 is a wasteful number, since it uses less digits than its factorization.

171291887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13176312.

The product of its digits is 56448, while the sum is 44.

The square root of 171291887 is about 13087.8526504542. The cubic root of 171291887 is about 555.3655433494.

The spelling of 171291887 in words is "one hundred seventy-one million, two hundred ninety-one thousand, eight hundred eighty-seven".