1217971 has 4 divisors (see below), whose sum is σ = 1260000. Its totient is φ = 1175944.

The previous prime is 1217963. The next prime is 1217977. The reversal of 1217971 is 1797121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1217971 - 2³ = 1217963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1217977) 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 3 ways as a sum of consecutive naturals, for example, 20971 + ... + 21028.

It is an arithmetic number, because the mean of its divisors is an integer number (315000).

2^1217971 is an apocalyptic number.

1217971 is a deficient number, since it is larger than the sum of its proper divisors (42029).

1217971 is an equidigital number, since it uses as much as digits as its factorization.

1217971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42028.

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

The square root of 1217971 is about 1103.6172343707. The cubic root of 1217971 is about 106.7937038936.

The spelling of 1217971 in words is "one million, two hundred seventeen thousand, nine hundred seventy-one".