259191689 has 2 divisors, whose sum is σ = 259191690. Its totient is φ = 259191688.

The previous prime is 259191649. The next prime is 259191703. The reversal of 259191689 is 986191952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132066064 + 127125625 = 11492^2 + 11275^2 .

It is a cyclic number.

It is not a de Polignac number, because 259191689 - 2⁸ = 259191433 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (259191619) 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 as a sum of consecutive naturals, namely, 129595844 + 129595845.

It is an arithmetic number, because the mean of its divisors is an integer number (129595845).

Almost surely, 2^259191689 is an apocalyptic number.

It is an amenable number.

259191689 is a deficient number, since it is larger than the sum of its proper divisors (1).

259191689 is an equidigital number, since it uses as much as digits as its factorization.

259191689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 50.

The square root of 259191689 is about 16099.4313253605. The cubic root of 259191689 is about 637.5883268107.

The spelling of 259191689 in words is "two hundred fifty-nine million, one hundred ninety-one thousand, six hundred eighty-nine".