1216171 has 18 divisors (see below), whose sum is σ = 1470980. Its totient is φ = 1001880.

The previous prime is 1216151. The next prime is 1216177. The reversal of 1216171 is 1716121.

It is not a de Polignac number, because 1216171 - 2⁷ = 1216043 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (1216177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 52866 + ... + 52888.

2^1216171 is an apocalyptic number.

1216171 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1216171 is a deficient number, since it is larger than the sum of its proper divisors (254809).

1216171 is a wasteful number, since it uses less digits than its factorization.

1216171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87 (or 53 counting only the distinct ones).

The product of its digits is 84, while the sum is 19.

The square root of 1216171 is about 1102.8014327158. The cubic root of 1216171 is about 106.7410689675.

Multiplying 1216171 by its sum of digits (19), we get a square (23107249 = 4807²).

1216171 divided by its sum of digits (19) gives a square (64009 = 253²).

It can be divided in two parts, 1216 and 171, that multiplied together give a square (207936 = 456²).

The spelling of 1216171 in words is "one million, two hundred sixteen thousand, one hundred seventy-one".