521059859 has 4 divisors (see below), whose sum is σ = 521386920. Its totient is φ = 520732800.

The previous prime is 521059831. The next prime is 521059867. The reversal of 521059859 is 958950125.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 521059859 - 2¹⁶ = 520994323 is a prime.

It is a super-2 number, since 2×521059859² = 543006753322199762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521059879) 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 in 3 ways as a sum of consecutive naturals, for example, 161129 + ... + 164330.

It is an arithmetic number, because the mean of its divisors is an integer number (130346730).

Almost surely, 2^521059859 is an apocalyptic number.

521059859 is a deficient number, since it is larger than the sum of its proper divisors (327061).

521059859 is a wasteful number, since it uses less digits than its factorization.

521059859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327060.

The product of its (nonzero) digits is 162000, while the sum is 44.

The square root of 521059859 is about 22826.7356185680. The cubic root of 521059859 is about 804.6911145989.

The spelling of 521059859 in words is "five hundred twenty-one million, fifty-nine thousand, eight hundred fifty-nine".