1219121 has 4 divisors (see below), whose sum is σ = 1290852. Its totient is φ = 1147392.

The previous prime is 1219111. The next prime is 1219123.

1219121 is nontrivially palindromic in base 10.

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

It can be written as a sum of positive squares in 2 ways, for example, as 640000 + 579121 = 800^2 + 761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1219121 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 71713 = 1219121 / (1 + 2 + 1 + 9 + 1 + 2 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1219121.

It is not an unprimeable number, because it can be changed into a prime (1219123) 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, 35840 + ... + 35873.

It is an arithmetic number, because the mean of its divisors is an integer number (322713).

2^1219121 is an apocalyptic number.

It is an amenable number.

1219121 is a deficient number, since it is larger than the sum of its proper divisors (71731).

1219121 is an equidigital number, since it uses as much as digits as its factorization.

1219121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71730.

The product of its digits is 36, while the sum is 17.

The square root of 1219121 is about 1104.1381254173. The cubic root of 1219121 is about 106.8273046189.

The spelling of 1219121 in words is "one million, two hundred nineteen thousand, one hundred twenty-one".