1228561 has 4 divisors (see below), whose sum is σ = 1268224. Its totient is φ = 1188900.

The previous prime is 1228547. The next prime is 1228567. The reversal of 1228561 is 1658221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1228561 - 2¹³ = 1220369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1228567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19785 + ... + 19846.

It is an arithmetic number, because the mean of its divisors is an integer number (317056).

2^1228561 is an apocalyptic number.

It is an amenable number.

1228561 is a deficient number, since it is larger than the sum of its proper divisors (39663).

1228561 is an equidigital number, since it uses as much as digits as its factorization.

1228561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39662.

The product of its digits is 960, while the sum is 25.

The square root of 1228561 is about 1108.4047094812. The cubic root of 1228561 is about 107.1023273582.

The spelling of 1228561 in words is "one million, two hundred twenty-eight thousand, five hundred sixty-one".