99897641 has 2 divisors, whose sum is σ = 99897642. Its totient is φ = 99897640.

The previous prime is 99897631. The next prime is 99897667. The reversal of 99897641 is 14679899.

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., 80281600 + 19616041 = 8960^2 + 4429^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99897641 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99897601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49948820 + 49948821.

It is an arithmetic number, because the mean of its divisors is an integer number (49948821).

Almost surely, 2^99897641 is an apocalyptic number.

It is an amenable number.

99897641 is a deficient number, since it is larger than the sum of its proper divisors (1).

99897641 is an equidigital number, since it uses as much as digits as its factorization.

99897641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 53.

The square root of 99897641 is about 9994.8807396587. The cubic root of 99897641 is about 464.0004598316. Note that the first 3 decimals are identical.

The spelling of 99897641 in words is "ninety-nine million, eight hundred ninety-seven thousand, six hundred forty-one".