320539861 has 16 divisors (see below), whose sum is σ = 347918400. Its totient is φ = 294357888.

The previous prime is 320539841. The next prime is 320539873. The reversal of 320539861 is 168935023.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-320539861 is a prime.

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 320539861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320539831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79875 + ... + 83791.

It is an arithmetic number, because the mean of its divisors is an integer number (21744900).

Almost surely, 2^320539861 is an apocalyptic number.

It is an amenable number.

320539861 is a deficient number, since it is larger than the sum of its proper divisors (27378539).

320539861 is a wasteful number, since it uses less digits than its factorization.

320539861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4068.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 320539861 is about 17903.6270347659. The cubic root of 320539861 is about 684.3748081177.

It can be divided in two parts, 32053 and 9861, that added together give a palindrome (41914).

The spelling of 320539861 in words is "three hundred twenty million, five hundred thirty-nine thousand, eight hundred sixty-one".