320546881 has 4 divisors (see below), whose sum is σ = 320596564. Its totient is φ = 320497200.

The previous prime is 320546843. The next prime is 320546899. The reversal of 320546881 is 188645023.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 307651600 + 12895281 = 17540^2 + 3591^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320546881 is a prime.

It is a super-2 number, since 2×320546881² = 205500605837656322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 320546881.

It is not an unprimeable number, because it can be changed into a prime (320546801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13410 + ... + 28651.

It is an arithmetic number, because the mean of its divisors is an integer number (80149141).

Almost surely, 2^320546881 is an apocalyptic number.

It is an amenable number.

320546881 is a deficient number, since it is larger than the sum of its proper divisors (49683).

320546881 is an equidigital number, since it uses as much as digits as its factorization.

320546881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49682.

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 320546881 is about 17903.8230833529. The cubic root of 320546881 is about 684.3798041433.

It can be divided in two parts, 3205 and 46881, that added together give a triangular number (50086 = T₃₁₆).

The spelling of 320546881 in words is "three hundred twenty million, five hundred forty-six thousand, eight hundred eighty-one".