1218121 has 2 divisors, whose sum is σ = 1218122. Its totient is φ = 1218120.

The previous prime is 1218089. The next prime is 1218131.

1218121 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 881721 + 336400 = 939^2 + 580^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 1218121 - 2⁵ = 1218089 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 1218095 and 1218104.

It is not a weakly prime, because it can be changed into another prime (1218131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609060 + 609061.

It is an arithmetic number, because the mean of its divisors is an integer number (609061).

2^1218121 is an apocalyptic number.

It is an amenable number.

1218121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218121 is an equidigital number, since it uses as much as digits as its factorization.

1218121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32, while the sum is 16.

The square root of 1218121 is about 1103.6851906228. The cubic root of 1218121 is about 106.7980877961.

The spelling of 1218121 in words is "one million, two hundred eighteen thousand, one hundred twenty-one".