171987101 has 24 divisors (see below), whose sum is σ = 210212352. Its totient is φ = 139629600.

The previous prime is 171987097. The next prime is 171987131. The reversal of 171987101 is 101789171.

It is not a de Polignac number, because 171987101 - 2² = 171987097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171987131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47000 + ... + 50526.

It is an arithmetic number, because the mean of its divisors is an integer number (8758848).

Almost surely, 2^171987101 is an apocalyptic number.

171987101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

171987101 is a deficient number, since it is larger than the sum of its proper divisors (38225251).

171987101 is a wasteful number, since it uses less digits than its factorization.

171987101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3593 (or 3582 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 35.

The square root of 171987101 is about 13114.3852696190. The cubic root of 171987101 is about 556.1158741379.

The spelling of 171987101 in words is "one hundred seventy-one million, nine hundred eighty-seven thousand, one hundred one".