259981 has 8 divisors (see below), whose sum is σ = 282744. Its totient is φ = 238080.

The previous prime is 259967. The next prime is 259991. The reversal of 259981 is 189952.

It can be written as a sum of positive squares in 4 ways, for example, as 19881 + 240100 = 141^2 + 490^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 259981 - 2⁵ = 259949 is a prime.

It is a super-2 number, since 2×259981² = 135180240722, which contains 22 as substring.

259981 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (259991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 511 + ... + 883.

It is an arithmetic number, because the mean of its divisors is an integer number (35343).

2²⁵⁹⁹⁸¹ is an apocalyptic number.

It is an amenable number.

259981 is a deficient number, since it is larger than the sum of its proper divisors (22763).

259981 is a wasteful number, since it uses less digits than its factorization.

259981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431.

The product of its digits is 6480, while the sum is 34.

The square root of 259981 is about 509.8833199861. The cubic root of 259981 is about 63.8234882381.

The spelling of 259981 in words is "two hundred fifty-nine thousand, nine hundred eighty-one".