1663171 has 4 divisors (see below), whose sum is σ = 1668312. Its totient is φ = 1658032.

The previous prime is 1663169. The next prime is 1663183. The reversal of 1663171 is 1713661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1713661 = 23 ⋅74507.

It is a cyclic number.

It is not a de Polignac number, because 1663171 - 2¹ = 1663169 is a prime.

It is a super-2 number, since 2×1663171² = 5532275550482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1663771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2050 + ... + 2743.

It is an arithmetic number, because the mean of its divisors is an integer number (417078).

2^1663171 is an apocalyptic number.

1663171 is a deficient number, since it is larger than the sum of its proper divisors (5141).

1663171 is an equidigital number, since it uses as much as digits as its factorization.

1663171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5140.

The product of its digits is 756, while the sum is 25.

The square root of 1663171 is about 1289.6398722124. The cubic root of 1663171 is about 118.4801607075.

The spelling of 1663171 in words is "one million, six hundred sixty-three thousand, one hundred seventy-one".