521676447 has 16 divisors (see below), whose sum is σ = 723987840. Its totient is φ = 333722592.

The previous prime is 521676391. The next prime is 521676451. The reversal of 521676447 is 744676125.

It is not a de Polignac number, because 521676447 - 2⁶ = 521676383 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 521676399 and 521676408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521676047) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4213 + ... + 32574.

It is an arithmetic number, because the mean of its divisors is an integer number (45249240).

Almost surely, 2^521676447 is an apocalyptic number.

521676447 is a deficient number, since it is larger than the sum of its proper divisors (202311393).

521676447 is a wasteful number, since it uses less digits than its factorization.

521676447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36982.

The product of its digits is 282240, while the sum is 42.

The square root of 521676447 is about 22840.2374549828. The cubic root of 521676447 is about 805.0083956791.

The spelling of 521676447 in words is "five hundred twenty-one million, six hundred seventy-six thousand, four hundred forty-seven".