99730891 has 16 divisors (see below), whose sum is σ = 115111584. Its totient is φ = 85584384.

The previous prime is 99730879. The next prime is 99730957. The reversal of 99730891 is 19803799.

It is a cyclic number.

It is not a de Polignac number, because 99730891 - 2¹¹ = 99728843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99730801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15625 + ... + 21061.

It is an arithmetic number, because the mean of its divisors is an integer number (7194474).

Almost surely, 2^99730891 is an apocalyptic number.

99730891 is a deficient number, since it is larger than the sum of its proper divisors (15380693).

99730891 is a wasteful number, since it uses less digits than its factorization.

99730891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5550.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 99730891 is about 9986.5354853423. The cubic root of 99730891 is about 463.7421448673.

The spelling of 99730891 in words is "ninety-nine million, seven hundred thirty thousand, eight hundred ninety-one".