897122309 has 2 divisors, whose sum is σ = 897122310. Its totient is φ = 897122308.

The previous prime is 897122273. The next prime is 897122329. The reversal of 897122309 is 903221798.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 881496100 + 15626209 = 29690^2 + 3953^2 .

It is a cyclic number.

It is not a de Polignac number, because 897122309 - 2⁸ = 897122053 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 (897122329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 448561154 + 448561155.

It is an arithmetic number, because the mean of its divisors is an integer number (448561155).

Almost surely, 2^897122309 is an apocalyptic number.

It is an amenable number.

897122309 is a deficient number, since it is larger than the sum of its proper divisors (1).

897122309 is an equidigital number, since it uses as much as digits as its factorization.

897122309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 897122309 is about 29952.0000834669. Note that the first 4 decimals coincide. The cubic root of 897122309 is about 964.4592562302.

The spelling of 897122309 in words is "eight hundred ninety-seven million, one hundred twenty-two thousand, three hundred nine".