521540845 has 16 divisors (see below), whose sum is σ = 716444928. Its totient is φ = 357033600.

The previous prime is 521540839. The next prime is 521540881. The reversal of 521540845 is 548045125.

It is a happy number.

It is not a de Polignac number, because 521540845 - 2⁹ = 521540333 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 521540845.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9520 + ... + 33670.

It is an arithmetic number, because the mean of its divisors is an integer number (44777808).

Almost surely, 2^521540845 is an apocalyptic number.

It is an amenable number.

521540845 is a deficient number, since it is larger than the sum of its proper divisors (194904083).

521540845 is a wasteful number, since it uses less digits than its factorization.

521540845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24780.

The product of its (nonzero) digits is 32000, while the sum is 34.

The square root of 521540845 is about 22837.2687727758. The cubic root of 521540845 is about 804.9386396654.

The spelling of 521540845 in words is "five hundred twenty-one million, five hundred forty thousand, eight hundred forty-five".