897506921 has 2 divisors, whose sum is σ = 897506922. Its totient is φ = 897506920.

The previous prime is 897506917. The next prime is 897506957. The reversal of 897506921 is 129605798.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 884467600 + 13039321 = 29740^2 + 3611^2 .

It is a cyclic number.

It is not a de Polignac number, because 897506921 - 2² = 897506917 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (897506221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 448753460 + 448753461.

It is an arithmetic number, because the mean of its divisors is an integer number (448753461).

Almost surely, 2^897506921 is an apocalyptic number.

It is an amenable number.

897506921 is a deficient number, since it is larger than the sum of its proper divisors (1).

897506921 is an equidigital number, since it uses as much as digits as its factorization.

897506921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 47.

The square root of 897506921 is about 29958.4198682107. The cubic root of 897506921 is about 964.5970633804.

The spelling of 897506921 in words is "eight hundred ninety-seven million, five hundred six thousand, nine hundred twenty-one".