897632221 has 4 divisors (see below), whose sum is σ = 914568732. Its totient is φ = 880695712.

The previous prime is 897632167. The next prime is 897632227. The reversal of 897632221 is 122236798.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 692426596 + 205205625 = 26314^2 + 14325^2 .

It is a cyclic number.

It is not a de Polignac number, because 897632221 - 2²⁵ = 864077789 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 (897632227) 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, 8468176 + ... + 8468281.

It is an arithmetic number, because the mean of its divisors is an integer number (228642183).

Almost surely, 2^897632221 is an apocalyptic number.

It is an amenable number.

897632221 is a deficient number, since it is larger than the sum of its proper divisors (16936511).

897632221 is a wasteful number, since it uses less digits than its factorization.

897632221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16936510.

The product of its digits is 72576, while the sum is 40.

The square root of 897632221 is about 29960.5110270169. The cubic root of 897632221 is about 964.6419500864.

The spelling of 897632221 in words is "eight hundred ninety-seven million, six hundred thirty-two thousand, two hundred twenty-one".