259105621 has 2 divisors, whose sum is σ = 259105622. Its totient is φ = 259105620.

The previous prime is 259105589. The next prime is 259105669. The reversal of 259105621 is 126501952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 253764900 + 5340721 = 15930^2 + 2311^2 .

It is a cyclic number.

It is not a de Polignac number, because 259105621 - 2⁵ = 259105589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (259105681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129552810 + 129552811.

It is an arithmetic number, because the mean of its divisors is an integer number (129552811).

Almost surely, 2^259105621 is an apocalyptic number.

It is an amenable number.

259105621 is a deficient number, since it is larger than the sum of its proper divisors (1).

259105621 is an equidigital number, since it uses as much as digits as its factorization.

259105621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 259105621 is about 16096.7580897521. The cubic root of 259105621 is about 637.5177458087.

The spelling of 259105621 in words is "two hundred fifty-nine million, one hundred five thousand, six hundred twenty-one".