99866849 has 2 divisors, whose sum is σ = 99866850. Its totient is φ = 99866848.

The previous prime is 99866813. The next prime is 99866861. The reversal of 99866849 is 94866899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87086224 + 12780625 = 9332^2 + 3575^2 .

It is an emirp because it is prime and its reverse (94866899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99866849 - 2¹⁶ = 99801313 is a prime.

It is not a weakly prime, because it can be changed into another prime (99866149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49933424 + 49933425.

It is an arithmetic number, because the mean of its divisors is an integer number (49933425).

Almost surely, 2^99866849 is an apocalyptic number.

It is an amenable number.

99866849 is a deficient number, since it is larger than the sum of its proper divisors (1).

99866849 is an equidigital number, since it uses as much as digits as its factorization.

99866849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6718464, while the sum is 59.

The square root of 99866849 is about 9993.3402323748. The cubic root of 99866849 is about 463.9527811269.

The spelling of 99866849 in words is "ninety-nine million, eight hundred sixty-six thousand, eight hundred forty-nine".