99608681 has 2 divisors, whose sum is σ = 99608682. Its totient is φ = 99608680.

The previous prime is 99608671. The next prime is 99608689. The reversal of 99608681 is 18680699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99600400 + 8281 = 9980^2 + 91^2 .

It is an emirp because it is prime and its reverse (18680699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99608681 - 2¹⁰ = 99607657 is a prime.

It is a super-2 number, since 2×99608681² = 19843778661119522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99608689) 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, 49804340 + 49804341.

It is an arithmetic number, because the mean of its divisors is an integer number (49804341).

Almost surely, 2^99608681 is an apocalyptic number.

It is an amenable number.

99608681 is a deficient number, since it is larger than the sum of its proper divisors (1).

99608681 is an equidigital number, since it uses as much as digits as its factorization.

99608681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 99608681 is about 9980.4148711364. The cubic root of 99608681 is about 463.5526445962.

The spelling of 99608681 in words is "ninety-nine million, six hundred eight thousand, six hundred eighty-one".