1221583 has 4 divisors (see below), whose sum is σ = 1332648. Its totient is φ = 1110520.

The previous prime is 1221559. The next prime is 1221589. The reversal of 1221583 is 3851221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3851221 = 11 ⋅350111.

It is a cyclic number.

It is not a de Polignac number, because 1221583 - 2⁵ = 1221551 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 (1221589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55516 + ... + 55537.

It is an arithmetic number, because the mean of its divisors is an integer number (333162).

2^1221583 is an apocalyptic number.

1221583 is a deficient number, since it is larger than the sum of its proper divisors (111065).

1221583 is a wasteful number, since it uses less digits than its factorization.

1221583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111064.

The product of its digits is 480, while the sum is 22.

The square root of 1221583 is about 1105.2524598480. The cubic root of 1221583 is about 106.8991684111.

The spelling of 1221583 in words is "one million, two hundred twenty-one thousand, five hundred eighty-three".