1320481553 has 4 divisors (see below), whose sum is σ = 1323462768. Its totient is φ = 1317500340.

The previous prime is 1320481541. The next prime is 1320481577. The reversal of 1320481553 is 3551840231.

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: 3551840231 = 751 ⋅4729481.

It is a cyclic number.

It is not a de Polignac number, because 1320481553 - 2¹⁰ = 1320480529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1320481753) 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, 1489943 + ... + 1490828.

It is an arithmetic number, because the mean of its divisors is an integer number (330865692).

Almost surely, 2^1320481553 is an apocalyptic number.

It is an amenable number.

1320481553 is a deficient number, since it is larger than the sum of its proper divisors (2981215).

1320481553 is an equidigital number, since it uses as much as digits as its factorization.

1320481553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2981214.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 1320481553 is about 36338.4307999121. The cubic root of 1320481553 is about 1097.0946894729.

The spelling of 1320481553 in words is "one billion, three hundred twenty million, four hundred eighty-one thousand, five hundred fifty-three".