320042581 has 2 divisors, whose sum is σ = 320042582. Its totient is φ = 320042580.

The previous prime is 320042573. The next prime is 320042587. The reversal of 320042581 is 185240023.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 278556100 + 41486481 = 16690^2 + 6441^2 .

It is a cyclic number.

It is not a de Polignac number, because 320042581 - 2³ = 320042573 is a prime.

It is a super-2 number, since 2×320042581² = 204854507306283122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (320042587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160021290 + 160021291.

It is an arithmetic number, because the mean of its divisors is an integer number (160021291).

Almost surely, 2^320042581 is an apocalyptic number.

It is an amenable number.

320042581 is a deficient number, since it is larger than the sum of its proper divisors (1).

320042581 is an equidigital number, since it uses as much as digits as its factorization.

320042581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 320042581 is about 17889.7339555400. The cubic root of 320042581 is about 684.0207158609.

The spelling of 320042581 in words is "three hundred twenty million, forty-two thousand, five hundred eighty-one".