9897761 has 2 divisors, whose sum is σ = 9897762. Its totient is φ = 9897760.

The previous prime is 9897749. The next prime is 9897793. The reversal of 9897761 is 1677989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6990736 + 2907025 = 2644^2 + 1705^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9897761 is a prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (9897161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4948880 + 4948881.

It is an arithmetic number, because the mean of its divisors is an integer number (4948881).

Almost surely, 2^9897761 is an apocalyptic number.

It is an amenable number.

9897761 is a deficient number, since it is larger than the sum of its proper divisors (1).

9897761 is an equidigital number, since it uses as much as digits as its factorization.

9897761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 47.

The square root of 9897761 is about 3146.0707239349. The cubic root of 9897761 is about 214.7067283208.

The spelling of 9897761 in words is "nine million, eight hundred ninety-seven thousand, seven hundred sixty-one".