659881 has 2 divisors, whose sum is σ = 659882. Its totient is φ = 659880.

The previous prime is 659873. The next prime is 659899. The reversal of 659881 is 188956.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 640000 + 19881 = 800^2 + 141^2 .

It is a cyclic number.

It is not a de Polignac number, because 659881 - 2³ = 659873 is a prime.

It is a super-2 number, since 2×659881² = 870885868322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 659881.

It is not a weakly prime, because it can be changed into another prime (659831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329940 + 329941.

It is an arithmetic number, because the mean of its divisors is an integer number (329941).

2⁶⁵⁹⁸⁸¹ is an apocalyptic number.

It is an amenable number.

659881 is a deficient number, since it is larger than the sum of its proper divisors (1).

659881 is an equidigital number, since it uses as much as digits as its factorization.

659881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 37.

The square root of 659881 is about 812.3305977248. The cubic root of 659881 is about 87.0606438501.

It can be divided in two parts, 659 and 881, that added together give a triangular number (1540 = T₅₅).

The spelling of 659881 in words is "six hundred fifty-nine thousand, eight hundred eighty-one".