99819649 has 4 divisors (see below), whose sum is σ = 100087636. Its totient is φ = 99551664.

The previous prime is 99819637. The next prime is 99819661. The reversal of 99819649 is 94691899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94691899 = 233 ⋅406403.

It is an interprime number because it is at equal distance from previous prime (99819637) and next prime (99819661).

It can be written as a sum of positive squares in 2 ways, for example, as 84272400 + 15547249 = 9180^2 + 3943^2 .

It is a cyclic number.

It is not a de Polignac number, because 99819649 - 2¹⁵ = 99786881 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99819649.

It is not an unprimeable number, because it can be changed into a prime (99819619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133434 + ... + 134179.

It is an arithmetic number, because the mean of its divisors is an integer number (25021909).

Almost surely, 2^99819649 is an apocalyptic number.

It is an amenable number.

99819649 is a deficient number, since it is larger than the sum of its proper divisors (267987).

99819649 is a wasteful number, since it uses less digits than its factorization.

99819649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267986.

The product of its digits is 1259712, while the sum is 55.

The square root of 99819649 is about 9990.9783805191. The cubic root of 99819649 is about 463.8796770476.

The spelling of 99819649 in words is "ninety-nine million, eight hundred nineteen thousand, six hundred forty-nine".