320045081 has 4 divisors (see below), whose sum is σ = 320101812. Its totient is φ = 319988352.

The previous prime is 320045071. The next prime is 320045083. The reversal of 320045081 is 180540023.

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 190881856 + 129163225 = 13816^2 + 11365^2 .

It is a cyclic number.

It is not a de Polignac number, because 320045081 - 2⁶ = 320045017 is a prime.

It is a super-2 number, since 2×320045081² = 204857707744593122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320045083) 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, 18836 + ... + 31541.

It is an arithmetic number, because the mean of its divisors is an integer number (80025453).

Almost surely, 2^320045081 is an apocalyptic number.

It is an amenable number.

320045081 is a deficient number, since it is larger than the sum of its proper divisors (56731).

320045081 is an equidigital number, since it uses as much as digits as its factorization.

320045081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56730.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 320045081 is about 17889.8038278792. The cubic root of 320045081 is about 684.0224969232.

The spelling of 320045081 in words is "three hundred twenty million, forty-five thousand, eighty-one".