897917249 has 2 divisors, whose sum is σ = 897917250. Its totient is φ = 897917248.

The previous prime is 897917231. The next prime is 897917311. The reversal of 897917249 is 942719798.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 640090000 + 257827249 = 25300^2 + 16057^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-897917249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 897917194 and 897917203.

It is not a weakly prime, because it can be changed into another prime (897910249) 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, 448958624 + 448958625.

It is an arithmetic number, because the mean of its divisors is an integer number (448958625).

Almost surely, 2^897917249 is an apocalyptic number.

It is an amenable number.

897917249 is a deficient number, since it is larger than the sum of its proper divisors (1).

897917249 is an equidigital number, since it uses as much as digits as its factorization.

897917249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2286144, while the sum is 56.

The square root of 897917249 is about 29965.2673774155. The cubic root of 897917249 is about 964.7440412185.

The spelling of 897917249 in words is "eight hundred ninety-seven million, nine hundred seventeen thousand, two hundred forty-nine".