1997171 has 8 divisors (see below), whose sum is σ = 2225664. Its totient is φ = 1776520.

The previous prime is 1997161. The next prime is 1997173. The reversal of 1997171 is 1717991.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1997171 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1997173) 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, 1415 + ... + 2448.

It is an arithmetic number, because the mean of its divisors is an integer number (278208).

2^1997171 is an apocalyptic number.

1997171 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1997171 is a deficient number, since it is larger than the sum of its proper divisors (228493).

1997171 is a wasteful number, since it uses less digits than its factorization.

1997171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3921.

The product of its digits is 3969, while the sum is 35.

The square root of 1997171 is about 1413.2130058841. The cubic root of 1997171 is about 125.9326716804.

The spelling of 1997171 in words is "one million, nine hundred ninety-seven thousand, one hundred seventy-one".