99944981 has 2 divisors, whose sum is σ = 99944982. Its totient is φ = 99944980.

The previous prime is 99944963. The next prime is 99945019. The reversal of 99944981 is 18944999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58277956 + 41667025 = 7634^2 + 6455^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99944981 is a prime.

It is a super-2 number, since 2×99944981² = 19977998454180722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99944941) 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, 49972490 + 49972491.

It is an arithmetic number, because the mean of its divisors is an integer number (49972491).

Almost surely, 2^99944981 is an apocalyptic number.

It is an amenable number.

99944981 is a deficient number, since it is larger than the sum of its proper divisors (1).

99944981 is an equidigital number, since it uses as much as digits as its factorization.

99944981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 839808, while the sum is 53.

The square root of 99944981 is about 9997.2486715096. The cubic root of 99944981 is about 464.0737425528.

The spelling of 99944981 in words is "ninety-nine million, nine hundred forty-four thousand, nine hundred eighty-one".