99966989 has 2 divisors, whose sum is σ = 99966990. Its totient is φ = 99966988.

The previous prime is 99966967. The next prime is 99966991. The reversal of 99966989 is 98966999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60062500 + 39904489 = 7750^2 + 6317^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99966989 is a prime.

It is a super-2 number, since 2×99966989² = 19986797779452242, which contains 22 as substring.

Together with 99966991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99966929) 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, 49983494 + 49983495.

It is an arithmetic number, because the mean of its divisors is an integer number (49983495).

Almost surely, 2^99966989 is an apocalyptic number.

It is an amenable number.

99966989 is a deficient number, since it is larger than the sum of its proper divisors (1).

99966989 is an equidigital number, since it uses as much as digits as its factorization.

99966989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17006112, while the sum is 65.

The square root of 99966989 is about 9998.3493137617. The cubic root of 99966989 is about 464.1078032439.

The spelling of 99966989 in words is "ninety-nine million, nine hundred sixty-six thousand, nine hundred eighty-nine".