659647391 has 18 divisors (see below), whose sum is σ = 731636928. Its totient is φ = 594462960.

The previous prime is 659647367. The next prime is 659647421. The reversal of 659647391 is 193746956.

It is not a de Polignac number, because 659647391 - 2¹⁰ = 659646367 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 (659647321) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 311426 + ... + 313536.

It is an arithmetic number, because the mean of its divisors is an integer number (40646496).

Almost surely, 2^659647391 is an apocalyptic number.

659647391 is a deficient number, since it is larger than the sum of its proper divisors (71989537).

659647391 is a wasteful number, since it uses less digits than its factorization.

659647391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2223 (or 2167 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 50.

The square root of 659647391 is about 25683.6015971281. The cubic root of 659647391 is about 870.5036899220.

The spelling of 659647391 in words is "six hundred fifty-nine million, six hundred forty-seven thousand, three hundred ninety-one".