1217121 has 16 divisors (see below), whose sum is σ = 1731840. Its totient is φ = 758160.

The previous prime is 1217119. The next prime is 1217131.

1217121 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1217121 - 2¹ = 1217119 is a prime.

1217121 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1217121.

It is not an unprimeable number, because it can be changed into a prime (1217131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7386 + ... + 7548.

It is an arithmetic number, because the mean of its divisors is an integer number (108240).

2^1217121 is an apocalyptic number.

It is an amenable number.

1217121 is a deficient number, since it is larger than the sum of its proper divisors (514719).

1217121 is a wasteful number, since it uses less digits than its factorization.

1217121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316.

The product of its digits is 28, while the sum is 15.

The square root of 1217121 is about 1103.2320698747. The cubic root of 1217121 is about 106.7688549787.

The spelling of 1217121 in words is "one million, two hundred seventeen thousand, one hundred twenty-one".