523670221 has 2 divisors, whose sum is σ = 523670222. Its totient is φ = 523670220.

The previous prime is 523670201. The next prime is 523670237. The reversal of 523670221 is 122076325.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 497914596 + 25755625 = 22314^2 + 5075^2 .

It is a cyclic number.

It is not a de Polignac number, because 523670221 - 2²¹ = 521573069 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 523670221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (523670201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 261835110 + 261835111.

It is an arithmetic number, because the mean of its divisors is an integer number (261835111).

Almost surely, 2^523670221 is an apocalyptic number.

It is an amenable number.

523670221 is a deficient number, since it is larger than the sum of its proper divisors (1).

523670221 is an equidigital number, since it uses as much as digits as its factorization.

523670221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 523670221 is about 22883.8419195729. The cubic root of 523670221 is about 806.0326349036.

It can be divided in two parts, 5236 and 70221, that added together give a palindrome (75457).

The spelling of 523670221 in words is "five hundred twenty-three million, six hundred seventy thousand, two hundred twenty-one".