659391 has 4 divisors (see below), whose sum is σ = 879192. Its totient is φ = 439592.

The previous prime is 659371. The next prime is 659419. The reversal of 659391 is 193956.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 659391 - 2⁶ = 659327 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (659371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109896 + ... + 109901.

It is an arithmetic number, because the mean of its divisors is an integer number (219798).

2⁶⁵⁹³⁹¹ is an apocalyptic number.

659391 is a deficient number, since it is larger than the sum of its proper divisors (219801).

659391 is a wasteful number, since it uses less digits than its factorization.

659391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219800.

The product of its digits is 7290, while the sum is 33.

The square root of 659391 is about 812.0289403710. The cubic root of 659391 is about 87.0390893178.

The spelling of 659391 in words is "six hundred fifty-nine thousand, three hundred ninety-one".