521579217 has 8 divisors (see below), whose sum is σ = 700045120. Its totient is φ = 345416400.

The previous prime is 521579213. The next prime is 521579231. The reversal of 521579217 is 712975125.

It is a happy number.

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

It is not a de Polignac number, because 521579217 - 2² = 521579213 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521579213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 575242 + ... + 576147.

It is an arithmetic number, because the mean of its divisors is an integer number (87505640).

Almost surely, 2^521579217 is an apocalyptic number.

It is an amenable number.

521579217 is a deficient number, since it is larger than the sum of its proper divisors (178465903).

521579217 is a wasteful number, since it uses less digits than its factorization.

521579217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151543.

The product of its digits is 44100, while the sum is 39.

The square root of 521579217 is about 22838.1088752988. The cubic root of 521579217 is about 804.9583801123.

The spelling of 521579217 in words is "five hundred twenty-one million, five hundred seventy-nine thousand, two hundred seventeen".