523005221 has 4 divisors (see below), whose sum is σ = 553770252. Its totient is φ = 492240192.

The previous prime is 523005209. The next prime is 523005271. The reversal of 523005221 is 122500325.

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

It can be written as a sum of positive squares in 2 ways, for example, as 214300321 + 308704900 = 14639^2 + 17570^2 .

It is a cyclic number.

It is not a de Polignac number, because 523005221 - 2⁶ = 523005157 is a prime.

It is a super-2 number, since 2×523005221² = 547068922386517682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 523005193 and 523005202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523005271) 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, 15382490 + ... + 15382523.

It is an arithmetic number, because the mean of its divisors is an integer number (138442563).

Almost surely, 2^523005221 is an apocalyptic number.

It is an amenable number.

523005221 is a deficient number, since it is larger than the sum of its proper divisors (30765031).

523005221 is a wasteful number, since it uses less digits than its factorization.

523005221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30765030.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 523005221 is about 22869.3074009687. The cubic root of 523005221 is about 805.6913012858.

Adding to 523005221 its reverse (122500325), we get a palindrome (645505546).

The spelling of 523005221 in words is "five hundred twenty-three million, five thousand, two hundred twenty-one".