259567421 has 2 divisors, whose sum is σ = 259567422. Its totient is φ = 259567420.

The previous prime is 259567403. The next prime is 259567423. The reversal of 259567421 is 124765952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 224580196 + 34987225 = 14986^2 + 5915^2 .

It is a cyclic number.

It is not a de Polignac number, because 259567421 - 2¹⁰ = 259566397 is a prime.

Together with 259567423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (259567423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129783710 + 129783711.

It is an arithmetic number, because the mean of its divisors is an integer number (129783711).

Almost surely, 2^259567421 is an apocalyptic number.

It is an amenable number.

259567421 is a deficient number, since it is larger than the sum of its proper divisors (1).

259567421 is an equidigital number, since it uses as much as digits as its factorization.

259567421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 151200, while the sum is 41.

The square root of 259567421 is about 16111.0962072728. The cubic root of 259567421 is about 637.8962670747.

The spelling of 259567421 in words is "two hundred fifty-nine million, five hundred sixty-seven thousand, four hundred twenty-one".