259552021 has 2 divisors, whose sum is σ = 259552022. Its totient is φ = 259552020.

The previous prime is 259552019. The next prime is 259552043. The reversal of 259552021 is 120255952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 255200625 + 4351396 = 15975^2 + 2086^2 .

It is a cyclic number.

It is not a de Polignac number, because 259552021 - 2¹ = 259552019 is a prime.

Together with 259552019, it forms a pair of twin primes.

It is equal to p_14172862 and since 259552021 and 14172862 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (259552721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129776010 + 129776011.

It is an arithmetic number, because the mean of its divisors is an integer number (129776011).

Almost surely, 2^259552021 is an apocalyptic number.

It is an amenable number.

259552021 is a deficient number, since it is larger than the sum of its proper divisors (1).

259552021 is an equidigital number, since it uses as much as digits as its factorization.

259552021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9000, while the sum is 31.

The square root of 259552021 is about 16110.6182687071. The cubic root of 259552021 is about 637.8836514740.

The spelling of 259552021 in words is "two hundred fifty-nine million, five hundred fifty-two thousand, twenty-one".