523845621 has 12 divisors (see below), whose sum is σ = 814871148. Its totient is φ = 322366464.

The previous prime is 523845611. The next prime is 523845629. The reversal of 523845621 is 126548325.

523845621 is a `hidden beast` number, since 5 + 23 + 8 + 4 + 5 + 621 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 336539025 + 187306596 = 18345^2 + 13686^2 .

It is not a de Polignac number, because 523845621 - 2⁹ = 523845109 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523845629) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2238540 + ... + 2238773.

It is an arithmetic number, because the mean of its divisors is an integer number (67905929).

Almost surely, 2^523845621 is an apocalyptic number.

It is an amenable number.

523845621 is a deficient number, since it is larger than the sum of its proper divisors (291025527).

523845621 is a wasteful number, since it uses less digits than its factorization.

523845621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4477332 (or 4477329 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 523845621 is about 22887.6739971540. The cubic root of 523845621 is about 806.1226166878.

The spelling of 523845621 in words is "five hundred twenty-three million, eight hundred forty-five thousand, six hundred twenty-one".