521380905 has 32 divisors (see below), whose sum is σ = 921694464. Its totient is φ = 250331136.

The previous prime is 521380897. The next prime is 521380907. The reversal of 521380905 is 509083125.

It is not a de Polignac number, because 521380905 - 2³ = 521380897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (521380907) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38584 + ... + 50313.

It is an arithmetic number, because the mean of its divisors is an integer number (28802952).

Almost surely, 2^521380905 is an apocalyptic number.

It is an amenable number.

521380905 is a deficient number, since it is larger than the sum of its proper divisors (400313559).

521380905 is a wasteful number, since it uses less digits than its factorization.

521380905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88945.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 521380905 is about 22833.7667720418. The cubic root of 521380905 is about 804.8563482208.

The spelling of 521380905 in words is "five hundred twenty-one million, three hundred eighty thousand, nine hundred five".