99729919 has 2 divisors, whose sum is σ = 99729920. Its totient is φ = 99729918.

The previous prime is 99729901. The next prime is 99729967. The reversal of 99729919 is 91992799.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99729919 - 2⁵ = 99729887 is a prime.

It is a super-2 number, since 2×99729919² = 19892113487493122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 99729919.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99729979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49864959 + 49864960.

It is an arithmetic number, because the mean of its divisors is an integer number (49864960).

Almost surely, 2^99729919 is an apocalyptic number.

99729919 is a deficient number, since it is larger than the sum of its proper divisors (1).

99729919 is an equidigital number, since it uses as much as digits as its factorization.

99729919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 826686, while the sum is 55.

The square root of 99729919 is about 9986.4868196979. The cubic root of 99729919 is about 463.7406382836.

It can be divided in two parts, 9972 and 9919, that added together give a palindrome (19891).

The spelling of 99729919 in words is "ninety-nine million, seven hundred twenty-nine thousand, nine hundred nineteen".