99724129 has 2 divisors, whose sum is σ = 99724130. Its totient is φ = 99724128.

The previous prime is 99724099. The next prime is 99724151. The reversal of 99724129 is 92142799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83539600 + 16184529 = 9140^2 + 4023^2 .

It is a cyclic number.

It is not a de Polignac number, because 99724129 - 2¹³ = 99715937 is a prime.

It is equal to p_5746489 and since 99724129 and 5746489 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (99724169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49862064 + 49862065.

It is an arithmetic number, because the mean of its divisors is an integer number (49862065).

Almost surely, 2^99724129 is an apocalyptic number.

It is an amenable number.

99724129 is a deficient number, since it is larger than the sum of its proper divisors (1).

99724129 is an equidigital number, since it uses as much as digits as its factorization.

99724129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 43.

The square root of 99724129 is about 9986.1969237543. The cubic root of 99724129 is about 463.7316636773.

The spelling of 99724129 in words is "ninety-nine million, seven hundred twenty-four thousand, one hundred twenty-nine".