521646222 has 8 divisors (see below), whose sum is σ = 1043292456. Its totient is φ = 173882072.

The previous prime is 521646221. The next prime is 521646253. The reversal of 521646222 is 222646125.

It is a happy number.

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

521646222 is an admirable number.

It is a super-2 number, since 2×521646222² = 544229561853746568, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 521646222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521646221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43470513 + ... + 43470524.

It is an arithmetic number, because the mean of its divisors is an integer number (130411557).

Almost surely, 2^521646222 is an apocalyptic number.

521646222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521646222 is a wasteful number, since it uses less digits than its factorization.

521646222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86941042.

The product of its digits is 11520, while the sum is 30.

The square root of 521646222 is about 22839.5757841515. The cubic root of 521646222 is about 804.9928484634.

The spelling of 521646222 in words is "five hundred twenty-one million, six hundred forty-six thousand, two hundred twenty-two".