659890391 has 4 divisors (see below), whose sum is σ = 660128784. Its totient is φ = 659652000.

The previous prime is 659890381. The next prime is 659890403. The reversal of 659890391 is 193098956.

659890391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 659890391 - 2⁶ = 659890327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (659890351) 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, 114995 + ... + 120596.

It is an arithmetic number, because the mean of its divisors is an integer number (165032196).

Almost surely, 2^659890391 is an apocalyptic number.

659890391 is a deficient number, since it is larger than the sum of its proper divisors (238393).

659890391 is a wasteful number, since it uses less digits than its factorization.

659890391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238392.

The product of its (nonzero) digits is 524880, while the sum is 50.

The square root of 659890391 is about 25688.3318064837. The cubic root of 659890391 is about 870.6105684505.

The spelling of 659890391 in words is "six hundred fifty-nine million, eight hundred ninety thousand, three hundred ninety-one".