521838189 has 6 divisors (see below), whose sum is σ = 753766286. Its totient is φ = 347892120.

The previous prime is 521838179. The next prime is 521838193. The reversal of 521838189 is 981838125.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 521756964 + 81225 = 22842^2 + 285^2 .

It is not a de Polignac number, because 521838189 - 2¹¹ = 521836141 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521838179) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28991002 + ... + 28991019.

Almost surely, 2^521838189 is an apocalyptic number.

It is an amenable number.

521838189 is a deficient number, since it is larger than the sum of its proper divisors (231928097).

521838189 is a wasteful number, since it uses less digits than its factorization.

521838189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57982027 (or 57982024 counting only the distinct ones).

The product of its digits is 138240, while the sum is 45.

The square root of 521838189 is about 22843.7779055917. Note that the first 3 decimals coincide. The cubic root of 521838189 is about 805.0915827546.

The spelling of 521838189 in words is "five hundred twenty-one million, eight hundred thirty-eight thousand, one hundred eighty-nine".