259025021 has 2 divisors, whose sum is σ = 259025022. Its totient is φ = 259025020.

The previous prime is 259024999. The next prime is 259025023. The reversal of 259025021 is 120520952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184824025 + 74200996 = 13595^2 + 8614^2 .

It is a cyclic number.

It is not a de Polignac number, because 259025021 - 2¹⁸ = 258762877 is a prime.

Together with 259025023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (259025023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129512510 + 129512511.

It is an arithmetic number, because the mean of its divisors is an integer number (129512511).

Almost surely, 2^259025021 is an apocalyptic number.

It is an amenable number.

259025021 is a deficient number, since it is larger than the sum of its proper divisors (1).

259025021 is an equidigital number, since it uses as much as digits as its factorization.

259025021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 259025021 is about 16094.2542853032. The cubic root of 259025021 is about 637.4516347262.

Adding to 259025021 its reverse (120520952), we get a palindrome (379545973).

The spelling of 259025021 in words is "two hundred fifty-nine million, twenty-five thousand, twenty-one".