521045911 has 4 divisors (see below), whose sum is σ = 548469400. Its totient is φ = 493622424.

The previous prime is 521045893. The next prime is 521045953. The reversal of 521045911 is 119540125.

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 521045911 - 2²³ = 512657303 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 521045911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521045981) 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 in 3 ways as a sum of consecutive naturals, for example, 13711716 + ... + 13711753.

It is an arithmetic number, because the mean of its divisors is an integer number (137117350).

Almost surely, 2^521045911 is an apocalyptic number.

521045911 is a deficient number, since it is larger than the sum of its proper divisors (27423489).

521045911 is a wasteful number, since it uses less digits than its factorization.

521045911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27423488.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 521045911 is about 22826.4300975864. The cubic root of 521045911 is about 804.6839344054.

The spelling of 521045911 in words is "five hundred twenty-one million, forty-five thousand, nine hundred eleven".