99943409 has 2 divisors, whose sum is σ = 99943410. Its totient is φ = 99943408.

The previous prime is 99943399. The next prime is 99943433. The reversal of 99943409 is 90434999.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74218225 + 25725184 = 8615^2 + 5072^2 .

It is an emirp because it is prime and its reverse (90434999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 99943409 - 2²⁰ = 98894833 is a prime.

It is not a weakly prime, because it can be changed into another prime (99943469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49971704 + 49971705.

It is an arithmetic number, because the mean of its divisors is an integer number (49971705).

Almost surely, 2^99943409 is an apocalyptic number.

It is an amenable number.

99943409 is a deficient number, since it is larger than the sum of its proper divisors (1).

99943409 is an equidigital number, since it uses as much as digits as its factorization.

99943409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 314928, while the sum is 47.

The square root of 99943409 is about 9997.1700495690. The cubic root of 99943409 is about 464.0713094550.

The spelling of 99943409 in words is "ninety-nine million, nine hundred forty-three thousand, four hundred nine".