171687997 has 8 divisors (see below), whose sum is σ = 185042816. Its totient is φ = 158354352.

The previous prime is 171687991. The next prime is 171688003. The reversal of 171687997 is 799786171.

171687997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (171687991) and next prime (171688003).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-171687997 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 (171687991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14248 + ... + 23374.

It is an arithmetic number, because the mean of its divisors is an integer number (23130352).

Almost surely, 2^171687997 is an apocalyptic number.

It is an amenable number.

171687997 is a deficient number, since it is larger than the sum of its proper divisors (13354819).

171687997 is a wasteful number, since it uses less digits than its factorization.

171687997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10587.

The product of its digits is 1333584, while the sum is 55.

The square root of 171687997 is about 13102.9766465487. The cubic root of 171687997 is about 555.7933053709.

The spelling of 171687997 in words is "one hundred seventy-one million, six hundred eighty-seven thousand, nine hundred ninety-seven".