522991 has 4 divisors (see below), whose sum is σ = 597712. Its totient is φ = 448272.

The previous prime is 522989. The next prime is 523007. The reversal of 522991 is 199225.

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 522991 - 2¹ = 522989 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 (522961) 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, 37350 + ... + 37363.

It is an arithmetic number, because the mean of its divisors is an integer number (149428).

2⁵²²⁹⁹¹ is an apocalyptic number.

522991 is a deficient number, since it is larger than the sum of its proper divisors (74721).

522991 is an equidigital number, since it uses as much as digits as its factorization.

522991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74720.

The product of its digits is 1620, while the sum is 28.

The square root of 522991 is about 723.1811667902. The cubic root of 522991 is about 80.5683998720.

The spelling of 522991 in words is "five hundred twenty-two thousand, nine hundred ninety-one".