1972171 has 4 divisors (see below), whose sum is σ = 1975000. Its totient is φ = 1969344.

The previous prime is 1972169. The next prime is 1972177. The reversal of 1972171 is 1712791.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1972171 - 2¹ = 1972169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1972177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 460 + ... + 2038.

It is an arithmetic number, because the mean of its divisors is an integer number (493750).

2^1972171 is an apocalyptic number.

1972171 is a deficient number, since it is larger than the sum of its proper divisors (2829).

1972171 is a wasteful number, since it uses less digits than its factorization.

1972171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2828.

The product of its digits is 882, while the sum is 28.

The square root of 1972171 is about 1404.3400585328. The cubic root of 1972171 is about 125.4050010427.

The spelling of 1972171 in words is "one million, nine hundred seventy-two thousand, one hundred seventy-one".