259242421 has 2 divisors, whose sum is σ = 259242422. Its totient is φ = 259242420.

The previous prime is 259242413. The next prime is 259242481. The reversal of 259242421 is 124242952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 258759396 + 483025 = 16086^2 + 695^2 .

It is a cyclic number.

It is not a de Polignac number, because 259242421 - 2³ = 259242413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (259242481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129621210 + 129621211.

It is an arithmetic number, because the mean of its divisors is an integer number (129621211).

Almost surely, 2^259242421 is an apocalyptic number.

It is an amenable number.

259242421 is a deficient number, since it is larger than the sum of its proper divisors (1).

259242421 is an equidigital number, since it uses as much as digits as its factorization.

259242421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 31.

The square root of 259242421 is about 16101.0068318723. The cubic root of 259242421 is about 637.6299228214.

The spelling of 259242421 in words is "two hundred fifty-nine million, two hundred forty-two thousand, four hundred twenty-one".