259421 has 2 divisors, whose sum is σ = 259422. Its totient is φ = 259420.

The previous prime is 259411. The next prime is 259429. The reversal of 259421 is 124952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 240100 + 19321 = 490^2 + 139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-259421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (259429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129710 + 129711.

It is an arithmetic number, because the mean of its divisors is an integer number (129711).

2²⁵⁹⁴²¹ is an apocalyptic number.

It is an amenable number.

259421 is a deficient number, since it is larger than the sum of its proper divisors (1).

259421 is an equidigital number, since it uses as much as digits as its factorization.

259421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 23.

The square root of 259421 is about 509.3338787083. Note that the first 3 decimals coincide. The cubic root of 259421 is about 63.7776299557. Note that the first 3 decimals are identical.

The spelling of 259421 in words is "two hundred fifty-nine thousand, four hundred twenty-one".