659689 has 2 divisors, whose sum is σ = 659690. Its totient is φ = 659688.

The previous prime is 659671. The next prime is 659693. The reversal of 659689 is 986956.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 648025 + 11664 = 805^2 + 108^2 .

It is a cyclic number.

It is not a de Polignac number, because 659689 - 2⁵ = 659657 is a prime.

It is not a weakly prime, because it can be changed into another prime (659609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329844 + 329845.

It is an arithmetic number, because the mean of its divisors is an integer number (329845).

2⁶⁵⁹⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

659689 is a deficient number, since it is larger than the sum of its proper divisors (1).

659689 is an equidigital number, since it uses as much as digits as its factorization.

659689 is an evil number, because the sum of its binary digits is even.

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

The square root of 659689 is about 812.2124106415. The cubic root of 659689 is about 87.0521992643.

It can be divided in two parts, 6 and 59689, that added together give a palindrome (59695).

The spelling of 659689 in words is "six hundred fifty-nine thousand, six hundred eighty-nine".