259942981 has 4 divisors (see below), whose sum is σ = 260002764. Its totient is φ = 259883200.

The previous prime is 259942961. The next prime is 259942997. The reversal of 259942981 is 189249952.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 130188100 + 129754881 = 11410^2 + 11391^2 .

It is a cyclic number.

It is not a de Polignac number, because 259942981 - 2¹⁵ = 259910213 is a prime.

It is a super-2 number, since 2×259942981² = 135140706742332722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (259942901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22810 + ... + 32251.

It is an arithmetic number, because the mean of its divisors is an integer number (65000691).

Almost surely, 2^259942981 is an apocalyptic number.

It is an amenable number.

259942981 is a deficient number, since it is larger than the sum of its proper divisors (59783).

259942981 is an equidigital number, since it uses as much as digits as its factorization.

259942981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59782.

The product of its digits is 466560, while the sum is 49.

The square root of 259942981 is about 16122.7473155167. The cubic root of 259942981 is about 638.2037695502.

The spelling of 259942981 in words is "two hundred fifty-nine million, nine hundred forty-two thousand, nine hundred eighty-one".