1228121 has 4 divisors (see below), whose sum is σ = 1270500. Its totient is φ = 1185744.

The previous prime is 1228109. The next prime is 1228133. The reversal of 1228121 is 1218221.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (1228109) and next prime (1228133).

It can be written as a sum of positive squares in 2 ways, for example, as 978121 + 250000 = 989^2 + 500^2 .

It is a cyclic number.

It is not a de Polignac number, because 1228121 - 2¹⁴ = 1211737 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1228121.

It is not an unprimeable number, because it can be changed into a prime (1228181) 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, 21146 + ... + 21203.

It is an arithmetic number, because the mean of its divisors is an integer number (317625).

2^1228121 is an apocalyptic number.

It is an amenable number.

1228121 is a deficient number, since it is larger than the sum of its proper divisors (42379).

1228121 is an equidigital number, since it uses as much as digits as its factorization.

1228121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42378.

The product of its digits is 64, while the sum is 17.

The square root of 1228121 is about 1108.2062082483. The cubic root of 1228121 is about 107.0895398638.

The spelling of 1228121 in words is "one million, two hundred twenty-eight thousand, one hundred twenty-one".