259494821 has 2 divisors, whose sum is σ = 259494822. Its totient is φ = 259494820.

The previous prime is 259494797. The next prime is 259494827. The reversal of 259494821 is 128494952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212022721 + 47472100 = 14561^2 + 6890^2 .

It is a cyclic number.

It is not a de Polignac number, because 259494821 - 2⁶ = 259494757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (259494827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129747410 + 129747411.

It is an arithmetic number, because the mean of its divisors is an integer number (129747411).

Almost surely, 2^259494821 is an apocalyptic number.

It is an amenable number.

259494821 is a deficient number, since it is larger than the sum of its proper divisors (1).

259494821 is an equidigital number, since it uses as much as digits as its factorization.

259494821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 44.

The square root of 259494821 is about 16108.8429441720. The cubic root of 259494821 is about 637.8367891593.

The spelling of 259494821 in words is "two hundred fifty-nine million, four hundred ninety-four thousand, eight hundred twenty-one".