1223520553 has 4 divisors (see below), whose sum is σ = 1223893840. Its totient is φ = 1223147268.

The previous prime is 1223520547. The next prime is 1223520577. The reversal of 1223520553 is 3550253221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3550253221 = 2897 ⋅1225493.

It is a cyclic number.

It is not a de Polignac number, because 1223520553 - 2⁹ = 1223520041 is a prime.

It is a super-2 number, since 2×1223520553² = 2994005087226851618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1223520593) 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, 181683 + ... + 188296.

It is an arithmetic number, because the mean of its divisors is an integer number (305973460).

Almost surely, 2^1223520553 is an apocalyptic number.

It is an amenable number.

1223520553 is a deficient number, since it is larger than the sum of its proper divisors (373287).

1223520553 is an equidigital number, since it uses as much as digits as its factorization.

1223520553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373286.

The product of its (nonzero) digits is 9000, while the sum is 28.

The square root of 1223520553 is about 34978.8586577664. The cubic root of 1223520553 is about 1069.5565615280.

Adding to 1223520553 its reverse (3550253221), we get a palindrome (4773773774).

The spelling of 1223520553 in words is "one billion, two hundred twenty-three million, five hundred twenty thousand, five hundred fifty-three".