897947989 has 2 divisors, whose sum is σ = 897947990. Its totient is φ = 897947988.

The previous prime is 897947971. The next prime is 897948001. The reversal of 897947989 is 989749798.

It is a happy number.

897947989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 455182225 + 442765764 = 21335^2 + 21042^2 .

It is a cyclic number.

It is not a de Polignac number, because 897947989 - 2¹⁷ = 897816917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (897947969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 448973994 + 448973995.

It is an arithmetic number, because the mean of its divisors is an integer number (448973995).

Almost surely, 2^897947989 is an apocalyptic number.

It is an amenable number.

897947989 is a deficient number, since it is larger than the sum of its proper divisors (1).

897947989 is an equidigital number, since it uses as much as digits as its factorization.

897947989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82301184, while the sum is 70.

The square root of 897947989 is about 29965.7803002024. The cubic root of 897947989 is about 964.7550503597.

The spelling of 897947989 in words is "eight hundred ninety-seven million, nine hundred forty-seven thousand, nine hundred eighty-nine".