99521791 has 8 divisors (see below), whose sum is σ = 110922480. Its totient is φ = 88737408.

The previous prime is 99521789. The next prime is 99521803. The reversal of 99521791 is 19712599.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99521791 - 2¹ = 99521789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99521291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153736 + ... + 154381.

It is an arithmetic number, because the mean of its divisors is an integer number (13865310).

Almost surely, 2^99521791 is an apocalyptic number.

99521791 is a deficient number, since it is larger than the sum of its proper divisors (11400689).

99521791 is a wasteful number, since it uses less digits than its factorization.

99521791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308153.

The product of its digits is 51030, while the sum is 43.

The square root of 99521791 is about 9976.0608959649. The cubic root of 99521791 is about 463.4178176371.

The spelling of 99521791 in words is "ninety-nine million, five hundred twenty-one thousand, seven hundred ninety-one".