521217055 has 8 divisors (see below), whose sum is σ = 625586400. Its totient is φ = 416889696.

The previous prime is 521216953. The next prime is 521217071. The reversal of 521217055 is 550712125.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 521217055 - 2²¹ = 519119903 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33886 + ... + 46804.

It is an arithmetic number, because the mean of its divisors is an integer number (78198300).

Almost surely, 2^521217055 is an apocalyptic number.

521217055 is a deficient number, since it is larger than the sum of its proper divisors (104369345).

521217055 is a wasteful number, since it uses less digits than its factorization.

521217055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20993.

The product of its (nonzero) digits is 3500, while the sum is 28.

The square root of 521217055 is about 22830.1786020171. The cubic root of 521217055 is about 804.7720275714.

The spelling of 521217055 in words is "five hundred twenty-one million, two hundred seventeen thousand, fifty-five".