320540553 has 12 divisors (see below), whose sum is σ = 464162868. Its totient is φ = 213158400.

The previous prime is 320540537. The next prime is 320540587. The reversal of 320540553 is 355045023.

320540553 is a `hidden beast` number, since 3 + 205 + 405 + 53 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 252428544 + 68112009 = 15888^2 + 8253^2 .

It is not a de Polignac number, because 320540553 - 2⁴ = 320540537 is a prime.

It is a super-2 number, since 2×320540553² = 205492492235091618, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (320540503) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40800 + ... + 48017.

It is an arithmetic number, because the mean of its divisors is an integer number (38680239).

Almost surely, 2^320540553 is an apocalyptic number.

It is an amenable number.

320540553 is a deficient number, since it is larger than the sum of its proper divisors (143622315).

320540553 is a wasteful number, since it uses less digits than its factorization.

320540553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89224 (or 89221 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 27.

The square root of 320540553 is about 17903.6463604485. The cubic root of 320540553 is about 684.3753006066.

Adding to 320540553 its reverse (355045023), we get a palindrome (675585576).

The spelling of 320540553 in words is "three hundred twenty million, five hundred forty thousand, five hundred fifty-three".