320859691 has 4 divisors (see below), whose sum is σ = 320952112. Its totient is φ = 320767272.

The previous prime is 320859667. The next prime is 320859697. The reversal of 320859691 is 196958023.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 196958023 = 4639 ⋅42457.

It is a cyclic number.

It is not a de Polignac number, because 320859691 - 2⁹ = 320859179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320859697) 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, 40791 + ... + 48016.

It is an arithmetic number, because the mean of its divisors is an integer number (80238028).

Almost surely, 2^320859691 is an apocalyptic number.

320859691 is a deficient number, since it is larger than the sum of its proper divisors (92421).

320859691 is an equidigital number, since it uses as much as digits as its factorization.

320859691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92420.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 320859691 is about 17912.5567968395. The cubic root of 320859691 is about 684.6023521896.

The spelling of 320859691 in words is "three hundred twenty million, eight hundred fifty-nine thousand, six hundred ninety-one".