521080385 has 16 divisors (see below), whose sum is σ = 715526400. Its totient is φ = 356861376.

The previous prime is 521080369. The next prime is 521080393. The reversal of 521080385 is 583080125.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 521080385 - 2⁴ = 521080369 is a prime.

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, 20036 + ... + 37994.

It is an arithmetic number, because the mean of its divisors is an integer number (44720400).

Almost surely, 2^521080385 is an apocalyptic number.

It is an amenable number.

521080385 is a deficient number, since it is larger than the sum of its proper divisors (194446015).

521080385 is a wasteful number, since it uses less digits than its factorization.

521080385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18800.

The product of its (nonzero) digits is 9600, while the sum is 32.

The square root of 521080385 is about 22827.1852185065. The cubic root of 521080385 is about 804.7016808020.

The spelling of 521080385 in words is "five hundred twenty-one million, eighty thousand, three hundred eighty-five".