897661997 has 2 divisors, whose sum is σ = 897661998. Its totient is φ = 897661996.

The previous prime is 897661981. The next prime is 897662021. The reversal of 897661997 is 799166798.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 865183396 + 32478601 = 29414^2 + 5699^2 .

It is a cyclic number.

It is not a de Polignac number, because 897661997 - 2⁴ = 897661981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (897661927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 448830998 + 448830999.

It is an arithmetic number, because the mean of its divisors is an integer number (448830999).

Almost surely, 2^897661997 is an apocalyptic number.

It is an amenable number.

897661997 is a deficient number, since it is larger than the sum of its proper divisors (1).

897661997 is an equidigital number, since it uses as much as digits as its factorization.

897661997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10287648, while the sum is 62.

The square root of 897661997 is about 29961.0079436590. The cubic root of 897661997 is about 964.6526162443.

The spelling of 897661997 in words is "eight hundred ninety-seven million, six hundred sixty-one thousand, nine hundred ninety-seven".