259260821 has 2 divisors, whose sum is σ = 259260822. Its totient is φ = 259260820.

The previous prime is 259260817. The next prime is 259260901. The reversal of 259260821 is 128062952.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 253159921 + 6100900 = 15911^2 + 2470^2 .

It is a cyclic number.

It is not a de Polignac number, because 259260821 - 2² = 259260817 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 (259269821) 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, 129630410 + 129630411.

It is an arithmetic number, because the mean of its divisors is an integer number (129630411).

Almost surely, 2^259260821 is an apocalyptic number.

It is an amenable number.

259260821 is a deficient number, since it is larger than the sum of its proper divisors (1).

259260821 is an equidigital number, since it uses as much as digits as its factorization.

259260821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 259260821 is about 16101.5782145726. The cubic root of 259260821 is about 637.6450079465.

The spelling of 259260821 in words is "two hundred fifty-nine million, two hundred sixty thousand, eight hundred twenty-one".