9801689 has 2 divisors, whose sum is σ = 9801690. Its totient is φ = 9801688.

The previous prime is 9801683. The next prime is 9801691. The reversal of 9801689 is 9861089.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6416089 + 3385600 = 2533^2 + 1840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9801689 is a prime.

Together with 9801691, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9801683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4900844 + 4900845.

It is an arithmetic number, because the mean of its divisors is an integer number (4900845).

Almost surely, 2^9801689 is an apocalyptic number.

It is an amenable number.

9801689 is a deficient number, since it is larger than the sum of its proper divisors (1).

9801689 is an equidigital number, since it uses as much as digits as its factorization.

9801689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 9801689 is about 3130.7649225070. The cubic root of 9801689 is about 214.0097893446.

The spelling of 9801689 in words is "nine million, eight hundred one thousand, six hundred eighty-nine".