521713279 has 2 divisors, whose sum is σ = 521713280. Its totient is φ = 521713278.

The previous prime is 521713271. The next prime is 521713331. The reversal of 521713279 is 972317125.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521713279 - 2³ = 521713271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521713271) 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, 260856639 + 260856640.

It is an arithmetic number, because the mean of its divisors is an integer number (260856640).

Almost surely, 2^521713279 is an apocalyptic number.

521713279 is a deficient number, since it is larger than the sum of its proper divisors (1).

521713279 is an equidigital number, since it uses as much as digits as its factorization.

521713279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26460, while the sum is 37.

The square root of 521713279 is about 22841.0437370975. The cubic root of 521713279 is about 805.0273406092.

It can be divided in two parts, 5217 and 13279, that added together give a square (18496 = 136²).

The spelling of 521713279 in words is "five hundred twenty-one million, seven hundred thirteen thousand, two hundred seventy-nine".