1266171 has 4 divisors (see below), whose sum is σ = 1688232. Its totient is φ = 844112.

The previous prime is 1266163. The next prime is 1266191. The reversal of 1266171 is 1716621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1716621 = 3 ⋅572207.

It is a cyclic number.

It is not a de Polignac number, because 1266171 - 2³ = 1266163 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1266101) 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, 211026 + ... + 211031.

It is an arithmetic number, because the mean of its divisors is an integer number (422058).

2^1266171 is an apocalyptic number.

1266171 is a deficient number, since it is larger than the sum of its proper divisors (422061).

1266171 is an equidigital number, since it uses as much as digits as its factorization.

1266171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422060.

The product of its digits is 504, while the sum is 24.

The square root of 1266171 is about 1125.2426405003. The cubic root of 1266171 is about 108.1842704655.

The spelling of 1266171 in words is "one million, two hundred sixty-six thousand, one hundred seventy-one".