897568813 has 4 divisors (see below), whose sum is σ = 936593568. Its totient is φ = 858544060.

The previous prime is 897568781. The next prime is 897568853. The reversal of 897568813 is 318865798.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 318865798 = 2 ⋅159432899.

It is a cyclic number.

It is not a de Polignac number, because 897568813 - 2⁵ = 897568781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (897568853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19512343 + ... + 19512388.

It is an arithmetic number, because the mean of its divisors is an integer number (234148392).

Almost surely, 2^897568813 is an apocalyptic number.

It is an amenable number.

897568813 is a deficient number, since it is larger than the sum of its proper divisors (39024755).

897568813 is a wasteful number, since it uses less digits than its factorization.

897568813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39024754.

The product of its digits is 2903040, while the sum is 55.

The square root of 897568813 is about 29959.4528154304. The cubic root of 897568813 is about 964.6192357142.

The spelling of 897568813 in words is "eight hundred ninety-seven million, five hundred sixty-eight thousand, eight hundred thirteen".