1221485 has 4 divisors (see below), whose sum is σ = 1465788. Its totient is φ = 977184.

The previous prime is 1221469. The next prime is 1221499. The reversal of 1221485 is 5841221.

1221485 = 781² + 782².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5841221 = 337 ⋅17333.

It can be written as a sum of positive squares in 2 ways, for example, as 611524 + 609961 = 782^2 + 781^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221485 - 2⁴ = 1221469 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 1221485.

It is a congruent number.

It is an unprimeable number.

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, 122144 + ... + 122153.

It is an arithmetic number, because the mean of its divisors is an integer number (366447).

2^1221485 is an apocalyptic number.

1221485 is the 782-nd centered square number.

It is an amenable number.

1221485 is a deficient number, since it is larger than the sum of its proper divisors (244303).

1221485 is an equidigital number, since it uses as much as digits as its factorization.

1221485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244302.

The product of its digits is 640, while the sum is 23.

The square root of 1221485 is about 1105.2081251963. The cubic root of 1221485 is about 106.8963097163.

The spelling of 1221485 in words is "one million, two hundred twenty-one thousand, four hundred eighty-five".