320297881 has 4 divisors (see below), whose sum is σ = 321480064. Its totient is φ = 319115700.

The previous prime is 320297869. The next prime is 320297899. The reversal of 320297881 is 188792023.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 320297881 - 2⁵ = 320297849 is a prime.

It is a super-2 number, since 2×320297881² = 205181465146180322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320297821) 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, 590685 + ... + 591226.

It is an arithmetic number, because the mean of its divisors is an integer number (80370016).

Almost surely, 2^320297881 is an apocalyptic number.

It is an amenable number.

320297881 is a deficient number, since it is larger than the sum of its proper divisors (1182183).

320297881 is a wasteful number, since it uses less digits than its factorization.

320297881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1182182.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 320297881 is about 17896.8679103356. The cubic root of 320297881 is about 684.2025500761.

The spelling of 320297881 in words is "three hundred twenty million, two hundred ninety-seven thousand, eight hundred eighty-one".