897897849 has 4 divisors (see below), whose sum is σ = 1197197136. Its totient is φ = 598598564.

The previous prime is 897897821. The next prime is 897897859. The reversal of 897897849 is 948798798.

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.

It is a cyclic number.

It is not a de Polignac number, because 897897849 - 2⁹ = 897897337 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (897897859) 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, 149649639 + ... + 149649644.

It is an arithmetic number, because the mean of its divisors is an integer number (299299284).

Almost surely, 2^897897849 is an apocalyptic number.

It is an amenable number.

897897849 is a deficient number, since it is larger than the sum of its proper divisors (299299287).

897897849 is a wasteful number, since it uses less digits than its factorization.

897897849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299299286.

The product of its digits is 73156608, while the sum is 69.

The square root of 897897849 is about 29964.9436675593. The cubic root of 897897849 is about 964.7370932252.

The spelling of 897897849 in words is "eight hundred ninety-seven million, eight hundred ninety-seven thousand, eight hundred forty-nine".