99570091 has 4 divisors (see below), whose sum is σ = 100120384. Its totient is φ = 99019800.

The previous prime is 99570077. The next prime is 99570101. The reversal of 99570091 is 19007599.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 99570091 - 2⁹ = 99569579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99570011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274875 + ... + 275236.

It is an arithmetic number, because the mean of its divisors is an integer number (25030096).

Almost surely, 2^99570091 is an apocalyptic number.

99570091 is a deficient number, since it is larger than the sum of its proper divisors (550293).

99570091 is a wasteful number, since it uses less digits than its factorization.

99570091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550292.

The product of its (nonzero) digits is 25515, while the sum is 40.

The square root of 99570091 is about 9978.4813974873. The cubic root of 99570091 is about 463.4927742885.

The spelling of 99570091 in words is "ninety-nine million, five hundred seventy thousand, ninety-one".