171971988 has 24 divisors (see below), whose sum is σ = 404822208. Its totient is φ = 56816256.

The previous prime is 171971959. The next prime is 171972029. The reversal of 171971988 is 889179171.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 171971988.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62056 + ... + 64767.

It is an arithmetic number, because the mean of its divisors is an integer number (16867592).

Almost surely, 2^171971988 is an apocalyptic number.

It is an amenable number.

171971988 is an abundant number, since it is smaller than the sum of its proper divisors (232850220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

171971988 is a wasteful number, since it uses less digits than its factorization.

171971988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126943 (or 126941 counting only the distinct ones).

The product of its digits is 254016, while the sum is 51.

The square root of 171971988 is about 13113.8090576308. The cubic root of 171971988 is about 556.0995844950.

The spelling of 171971988 in words is "one hundred seventy-one million, nine hundred seventy-one thousand, nine hundred eighty-eight".