1224991 has 2 divisors, whose sum is σ = 1224992. Its totient is φ = 1224990.

The previous prime is 1224983. The next prime is 1225009. The reversal of 1224991 is 1994221.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1224991 - 2³ = 1224983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1234991) 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 as a sum of consecutive naturals, namely, 612495 + 612496.

It is an arithmetic number, because the mean of its divisors is an integer number (612496).

2^1224991 is an apocalyptic number.

1224991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1224991 is an equidigital number, since it uses as much as digits as its factorization.

1224991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 28.

The square root of 1224991 is about 1106.7931152659. The cubic root of 1224991 is about 106.9984860181.

It can be divided in two parts, 122499 and 1, that added together give a square (122500 = 350²).

The spelling of 1224991 in words is "one million, two hundred twenty-four thousand, nine hundred ninety-one".