897936391521 has 24 divisors (see below), whose sum is σ = 1402943243520. Its totient is φ = 550141968096.

The previous prime is 897936391487. The next prime is 897936391543. The reversal of 897936391521 is 125193639798.

897936391521 is a `hidden beast` number, since 8 + 9 + 79 + 3 + 6 + 39 + 1 + 521 = 666.

897936391521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 897936391521 - 2¹⁰ = 897936390497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (897936398521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16878001 + ... + 16931118.

It is an arithmetic number, because the mean of its divisors is an integer number (58455968480).

Almost surely, 2^897936391521 is an apocalyptic number.

It is an amenable number.

897936391521 is a deficient number, since it is larger than the sum of its proper divisors (505006851999).

897936391521 is a wasteful number, since it uses less digits than its factorization.

897936391521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33809365 (or 33809362 counting only the distinct ones).

The product of its digits is 22044960, while the sum is 63.

The spelling of 897936391521 in words is "eight hundred ninety-seven billion, nine hundred thirty-six million, three hundred ninety-one thousand, five hundred twenty-one".