522531561 has 4 divisors (see below), whose sum is σ = 696708752. Its totient is φ = 348354372.

The previous prime is 522531547. The next prime is 522531587. The reversal of 522531561 is 165135225.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 522531561 - 2¹³ = 522523369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (522531461) 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, 87088591 + ... + 87088596.

It is an arithmetic number, because the mean of its divisors is an integer number (174177188).

Almost surely, 2^522531561 is an apocalyptic number.

It is an amenable number.

522531561 is a deficient number, since it is larger than the sum of its proper divisors (174177191).

522531561 is a wasteful number, since it uses less digits than its factorization.

522531561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174177190.

The product of its digits is 9000, while the sum is 30.

The square root of 522531561 is about 22858.9492540668. The cubic root of 522531561 is about 805.4480028824.

Adding to 522531561 its reverse (165135225), we get a palindrome (687666786).

The spelling of 522531561 in words is "five hundred twenty-two million, five hundred thirty-one thousand, five hundred sixty-one".