521742259 has 2 divisors, whose sum is σ = 521742260. Its totient is φ = 521742258.

The previous prime is 521742241. The next prime is 521742269. The reversal of 521742259 is 952247125.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 521742259 - 2⁵ = 521742227 is a prime.

It is not a weakly prime, because it can be changed into another prime (521742269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260871129 + 260871130.

It is an arithmetic number, because the mean of its divisors is an integer number (260871130).

Almost surely, 2^521742259 is an apocalyptic number.

521742259 is a deficient number, since it is larger than the sum of its proper divisors (1).

521742259 is an equidigital number, since it uses as much as digits as its factorization.

521742259 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 37.

The square root of 521742259 is about 22841.6781126081. The cubic root of 521742259 is about 805.0422461529.

The spelling of 521742259 in words is "five hundred twenty-one million, seven hundred forty-two thousand, two hundred fifty-nine".