320212553 has 4 divisors (see below), whose sum is σ = 320311188. Its totient is φ = 320113920.

The previous prime is 320212549. The next prime is 320212579. The reversal of 320212553 is 355212023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 355212023 = 23 ⋅15444001.

It can be written as a sum of positive squares in 2 ways, for example, as 279290944 + 40921609 = 16712^2 + 6397^2 .

It is a cyclic number.

It is not a de Polignac number, because 320212553 - 2² = 320212549 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320212513) 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, 44276 + ... + 50997.

It is an arithmetic number, because the mean of its divisors is an integer number (80077797).

Almost surely, 2^320212553 is an apocalyptic number.

It is an amenable number.

320212553 is a deficient number, since it is larger than the sum of its proper divisors (98635).

320212553 is an equidigital number, since it uses as much as digits as its factorization.

320212553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98634.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 320212553 is about 17894.4838707351. The cubic root of 320212553 is about 684.1417870346.

Adding to 320212553 its reverse (355212023), we get a palindrome (675424576).

The spelling of 320212553 in words is "three hundred twenty million, two hundred twelve thousand, five hundred fifty-three".