259621 has 2 divisors, whose sum is σ = 259622. Its totient is φ = 259620.

The previous prime is 259619. The next prime is 259627. The reversal of 259621 is 126952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 202500 + 57121 = 450^2 + 239^2 .

It is a cyclic number.

It is not a de Polignac number, because 259621 - 2¹ = 259619 is a prime.

Together with 259619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (259627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129810 + 129811.

It is an arithmetic number, because the mean of its divisors is an integer number (129811).

2²⁵⁹⁶²¹ is an apocalyptic number.

It is an amenable number.

259621 is a deficient number, since it is larger than the sum of its proper divisors (1).

259621 is an equidigital number, since it uses as much as digits as its factorization.

259621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 25.

The square root of 259621 is about 509.5301757502. The cubic root of 259621 is about 63.7940154828.

The spelling of 259621 in words is "two hundred fifty-nine thousand, six hundred twenty-one".