1225549 has 4 divisors (see below), whose sum is σ = 1319836. Its totient is φ = 1131264.

The previous prime is 1225541. The next prime is 1225559. The reversal of 1225549 is 9455221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9455221 = 2617 ⋅3613.

It can be written as a sum of positive squares in 2 ways, for example, as 189225 + 1036324 = 435^2 + 1018^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225549 - 2³ = 1225541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225541) 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, 47124 + ... + 47149.

It is an arithmetic number, because the mean of its divisors is an integer number (329959).

2^1225549 is an apocalyptic number.

It is an amenable number.

1225549 is a deficient number, since it is larger than the sum of its proper divisors (94287).

1225549 is an equidigital number, since it uses as much as digits as its factorization.

1225549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94286.

The product of its digits is 3600, while the sum is 28.

The square root of 1225549 is about 1107.0451661969. The cubic root of 1225549 is about 107.0147299720.

It can be divided in two parts, 122 and 5549, that added together give a triangular number (5671 = T₁₀₆).

The spelling of 1225549 in words is "one million, two hundred twenty-five thousand, five hundred forty-nine".