659691 has 16 divisors (see below), whose sum is σ = 997920. Its totient is φ = 430560.

The previous prime is 659689. The next prime is 659693. The reversal of 659691 is 196956.

It is an interprime number because it is at equal distance from previous prime (659689) and next prime (659693).

It is not a de Polignac number, because 659691 - 2¹ = 659689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (659693) 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, 1201 + ... + 1661.

It is an arithmetic number, because the mean of its divisors is an integer number (62370).

2⁶⁵⁹⁶⁹¹ is an apocalyptic number.

659691 is a deficient number, since it is larger than the sum of its proper divisors (338229).

659691 is a wasteful number, since it uses less digits than its factorization.

659691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523 (or 517 counting only the distinct ones).

The product of its digits is 14580, while the sum is 36.

The square root of 659691 is about 812.2136418455. The cubic root of 659691 is about 87.0522872372.

The spelling of 659691 in words is "six hundred fifty-nine thousand, six hundred ninety-one".