1221562 has 4 divisors (see below), whose sum is σ = 1832346. Its totient is φ = 610780.

The previous prime is 1221559. The next prime is 1221589. The reversal of 1221562 is 2651221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2651221 = 89 ⋅29789.

It can be written as a sum of positive squares in only one way, i.e., 848241 + 373321 = 921^2 + 611^2 .

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 as a sum of consecutive naturals, namely, 305389 + ... + 305392.

2^1221562 is an apocalyptic number.

1221562 is a deficient number, since it is larger than the sum of its proper divisors (610784).

1221562 is an equidigital number, since it uses as much as digits as its factorization.

1221562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610783.

The product of its digits is 240, while the sum is 19.

The square root of 1221562 is about 1105.2429597152. The cubic root of 1221562 is about 106.8985558465.

Adding to 1221562 its reverse (2651221), we get a palindrome (3872783).

The spelling of 1221562 in words is "one million, two hundred twenty-one thousand, five hundred sixty-two".