99724019 has 2 divisors, whose sum is σ = 99724020. Its totient is φ = 99724018.

The previous prime is 99724007. The next prime is 99724043. The reversal of 99724019 is 91042799.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (91042799) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99724019 is a prime.

It is a super-2 number, since 2×99724019² = 19889759931024722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (99724099) 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, 49862009 + 49862010.

It is an arithmetic number, because the mean of its divisors is an integer number (49862010).

Almost surely, 2^99724019 is an apocalyptic number.

99724019 is a deficient number, since it is larger than the sum of its proper divisors (1).

99724019 is an equidigital number, since it uses as much as digits as its factorization.

99724019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 99724019 is about 9986.1914161506. The cubic root of 99724019 is about 463.7314931719.

The spelling of 99724019 in words is "ninety-nine million, seven hundred twenty-four thousand, nineteen".