897998681 has 2 divisors, whose sum is σ = 897998682. Its totient is φ = 897998680.

The previous prime is 897998671. The next prime is 897998707. The reversal of 897998681 is 186899798.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 639078400 + 258920281 = 25280^2 + 16091^2 .

It is a cyclic number.

It is not a de Polignac number, because 897998681 - 2⁶ = 897998617 is a prime.

It is a super-2 number, since 2×897998681² = 1612803262155479522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (897998611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 448999340 + 448999341.

It is an arithmetic number, because the mean of its divisors is an integer number (448999341).

Almost surely, 2^897998681 is an apocalyptic number.

It is an amenable number.

897998681 is a deficient number, since it is larger than the sum of its proper divisors (1).

897998681 is an equidigital number, since it uses as much as digits as its factorization.

897998681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15676416, while the sum is 65.

The square root of 897998681 is about 29966.6261197353. The cubic root of 897998681 is about 964.7732045080.

The spelling of 897998681 in words is "eight hundred ninety-seven million, nine hundred ninety-eight thousand, six hundred eighty-one".