99743561 has 2 divisors, whose sum is σ = 99743562. Its totient is φ = 99743560.

The previous prime is 99743491. The next prime is 99743563. The reversal of 99743561 is 16534799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96904336 + 2839225 = 9844^2 + 1685^2 .

It is an emirp because it is prime and its reverse (16534799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99743561 - 2²² = 95549257 is a prime.

Together with 99743563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99743563) 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, 49871780 + 49871781.

It is an arithmetic number, because the mean of its divisors is an integer number (49871781).

Almost surely, 2^99743561 is an apocalyptic number.

It is an amenable number.

99743561 is a deficient number, since it is larger than the sum of its proper divisors (1).

99743561 is an equidigital number, since it uses as much as digits as its factorization.

99743561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 44.

The square root of 99743561 is about 9987.1698193232. The cubic root of 99743561 is about 463.7617822606.

The spelling of 99743561 in words is "ninety-nine million, seven hundred forty-three thousand, five hundred sixty-one".