259887869 has 2 divisors, whose sum is σ = 259887870. Its totient is φ = 259887868.

The previous prime is 259887851. The next prime is 259887917. The reversal of 259887869 is 968788952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139546969 + 120340900 = 11813^2 + 10970^2 .

It is a cyclic number.

It is not a de Polignac number, because 259887869 - 2²⁴ = 243110653 is a prime.

It is a super-2 number, since 2×259887869² = 135083408906722322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (259887809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129943934 + 129943935.

It is an arithmetic number, because the mean of its divisors is an integer number (129943935).

Almost surely, 2^259887869 is an apocalyptic number.

It is an amenable number.

259887869 is a deficient number, since it is larger than the sum of its proper divisors (1).

259887869 is an equidigital number, since it uses as much as digits as its factorization.

259887869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17418240, while the sum is 62.

The square root of 259887869 is about 16121.0380869223. The cubic root of 259887869 is about 638.1586632837.

The spelling of 259887869 in words is "two hundred fifty-nine million, eight hundred eighty-seven thousand, eight hundred sixty-nine".