1220553 has 6 divisors (see below), whose sum is σ = 1763034. Its totient is φ = 813696.

The previous prime is 1220507. The next prime is 1220591. The reversal of 1220553 is 3550221.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 915849 + 304704 = 957^2 + 552^2 .

It is not a de Polignac number, because 1220553 - 2⁶ = 1220489 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1220353) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67800 + ... + 67817.

It is an arithmetic number, because the mean of its divisors is an integer number (293839).

2^1220553 is an apocalyptic number.

It is an amenable number.

1220553 is a deficient number, since it is larger than the sum of its proper divisors (542481).

1220553 is a wasteful number, since it uses less digits than its factorization.

1220553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135623 (or 135620 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 1220553 is about 1104.7864046955. The cubic root of 1220553 is about 106.8691153013.

Adding to 1220553 its reverse (3550221), we get a palindrome (4770774).

The spelling of 1220553 in words is "one million, two hundred twenty thousand, five hundred fifty-three".