1213171 has 4 divisors (see below), whose sum is σ = 1284552.
Its totient is φ = 1141792.
The previous prime is 1213153. The next prime is 1213183. The reversal of 1213171 is 1713121.
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 1213171 - 217 = 1082099 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (1213141) 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, 35665 + ... + 35698.
It is an arithmetic number, because the mean of its divisors is an integer number (321138).
21213171 is an apocalyptic number.
1213171 is a deficient number, since it is larger than the sum of its proper divisors (71381).
1213171 is an equidigital number, since it uses as much as digits as its factorization.
1213171 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 71380.
The product of its digits is 42, while the sum is 16.
The square root of 1213171 is about 1101.4404205403.
The cubic root of 1213171 is about 106.6532285588.
Adding to 1213171 its reverse (1713121), we get a palindrome (2926292).
The spelling of 1213171 in words is "one million, two hundred thirteen thousand, one hundred seventy-one".