897506221 has 2 divisors, whose sum is σ = 897506222. Its totient is φ = 897506220.

The previous prime is 897506213. The next prime is 897506227. The reversal of 897506221 is 122605798.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 495062500 + 402443721 = 22250^2 + 20061^2 .

It is a cyclic number.

It is not a de Polignac number, because 897506221 - 2³ = 897506213 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (897506227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 448753110 + 448753111.

It is an arithmetic number, because the mean of its divisors is an integer number (448753111).

Almost surely, 2^897506221 is an apocalyptic number.

It is an amenable number.

897506221 is a deficient number, since it is larger than the sum of its proper divisors (1).

897506221 is an equidigital number, since it uses as much as digits as its factorization.

897506221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 897506221 is about 29958.4081853492. The cubic root of 897506221 is about 964.5968126049.

The spelling of 897506221 in words is "eight hundred ninety-seven million, five hundred six thousand, two hundred twenty-one".