1221249 has 4 divisors (see below), whose sum is σ = 1628336. Its totient is φ = 814164.

The previous prime is 1221247. The next prime is 1221251. The reversal of 1221249 is 9421221.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9421221 = 3 ⋅3140407.

It is an interprime number because it is at equal distance from previous prime (1221247) and next prime (1221251).

It is not a de Polignac number, because 1221249 - 2¹ = 1221247 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1221247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203539 + ... + 203544.

It is an arithmetic number, because the mean of its divisors is an integer number (407084).

2^1221249 is an apocalyptic number.

It is an amenable number.

1221249 is a deficient number, since it is larger than the sum of its proper divisors (407087).

1221249 is an equidigital number, since it uses as much as digits as its factorization.

1221249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407086.

The product of its digits is 288, while the sum is 21.

The square root of 1221249 is about 1105.1013528179. The cubic root of 1221249 is about 106.8894248852.

The spelling of 1221249 in words is "one million, two hundred twenty-one thousand, two hundred forty-nine".