521319897 has 12 divisors (see below), whose sum is σ = 860591680. Its totient is φ = 297897048.

The previous prime is 521319881. The next prime is 521319919. The reversal of 521319897 is 798913125.

521319897 is a `hidden beast` number, since 521 + 31 + 9 + 8 + 97 = 666.

It is not a de Polignac number, because 521319897 - 2⁴ = 521319881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521314897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4137397 + ... + 4137522.

Almost surely, 2^521319897 is an apocalyptic number.

It is an amenable number.

521319897 is a deficient number, since it is larger than the sum of its proper divisors (339271783).

521319897 is a wasteful number, since it uses less digits than its factorization.

521319897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8274932 (or 8274929 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 521319897 is about 22832.4308167133. The cubic root of 521319897 is about 804.8249542879.

The spelling of 521319897 in words is "five hundred twenty-one million, three hundred nineteen thousand, eight hundred ninety-seven".