521208055 has 4 divisors (see below), whose sum is σ = 625449672. Its totient is φ = 416966440.

The previous prime is 521208041. The next prime is 521208091. The reversal of 521208055 is 550802125.

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

It is not a de Polignac number, because 521208055 - 2⁹ = 521207543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52120801 + ... + 52120810.

It is an arithmetic number, because the mean of its divisors is an integer number (156362418).

Almost surely, 2^521208055 is an apocalyptic number.

521208055 is a deficient number, since it is larger than the sum of its proper divisors (104241617).

521208055 is a wasteful number, since it uses less digits than its factorization.

521208055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104241616.

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 521208055 is about 22829.9814936412. The cubic root of 521208055 is about 804.7673954705.

The spelling of 521208055 in words is "five hundred twenty-one million, two hundred eight thousand, fifty-five".