1221575 has 12 divisors (see below), whose sum is σ = 1530408. Its totient is φ = 967200.

The previous prime is 1221559. The next prime is 1221589. The reversal of 1221575 is 5751221.

It is a happy number.

It is not a de Polignac number, because 1221575 - 2⁴ = 1221559 is a prime.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221575.

It is a congruent number.

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 in 11 ways as a sum of consecutive naturals, for example, 3089 + ... + 3461.

It is an arithmetic number, because the mean of its divisors is an integer number (127534).

2^1221575 is an apocalyptic number.

1221575 is a deficient number, since it is larger than the sum of its proper divisors (308833).

1221575 is a wasteful number, since it uses less digits than its factorization.

1221575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514 (or 509 counting only the distinct ones).

The product of its digits is 700, while the sum is 23.

The square root of 1221575 is about 1105.2488407594. The cubic root of 1221575 is about 106.8989350540.

Adding to 1221575 its reverse (5751221), we get a palindrome (6972796).

The spelling of 1221575 in words is "one million, two hundred twenty-one thousand, five hundred seventy-five".