522009391 has 4 divisors (see below), whose sum is σ = 530566984. Its totient is φ = 513451800.

The previous prime is 522009373. The next prime is 522009407. The reversal of 522009391 is 193900225.

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

It is a cyclic number.

It is not a de Polignac number, because 522009391 - 2⁵ = 522009359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (522009091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4278705 + ... + 4278826.

It is an arithmetic number, because the mean of its divisors is an integer number (132641746).

Almost surely, 2^522009391 is an apocalyptic number.

522009391 is a deficient number, since it is larger than the sum of its proper divisors (8557593).

522009391 is an equidigital number, since it uses as much as digits as its factorization.

522009391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8557592.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 522009391 is about 22847.5248331192. The cubic root of 522009391 is about 805.1796165689.

The spelling of 522009391 in words is "five hundred twenty-two million, nine thousand, three hundred ninety-one".