320131553 has 6 divisors (see below), whose sum is σ = 372397986. Its totient is φ = 274398432.

The previous prime is 320131541. The next prime is 320131571. The reversal of 320131553 is 355131023.

It can be written as a sum of positive squares in only one way, i.e., 200732224 + 119399329 = 14168^2 + 10927^2 .

It is not a de Polignac number, because 320131553 - 2⁶ = 320131489 is a prime.

It is a super-2 number, since 2×320131553² = 204968422452383618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320031553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3266600 + ... + 3266697.

It is an arithmetic number, because the mean of its divisors is an integer number (62066331).

Almost surely, 2^320131553 is an apocalyptic number.

It is an amenable number.

320131553 is a deficient number, since it is larger than the sum of its proper divisors (52266433).

320131553 is an equidigital number, since it uses as much as digits as its factorization.

320131553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6533311 (or 6533304 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 23.

The square root of 320131553 is about 17892.2204603006. The cubic root of 320131553 is about 684.0840960234.

Adding to 320131553 its reverse (355131023), we get a palindrome (675262576).

The spelling of 320131553 in words is "three hundred twenty million, one hundred thirty-one thousand, five hundred fifty-three".