99997599 has 32 divisors (see below), whose sum is σ = 149796864. Its totient is φ = 58919040.

The previous prime is 99997571. The next prime is 99997609. The reversal of 99997599 is 99579999.

It is not a de Polignac number, because 99997599 - 2¹¹ = 99995551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99927599) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 128977 + ... + 129749.

It is an arithmetic number, because the mean of its divisors is an integer number (4681152).

Almost surely, 2^99997599 is an apocalyptic number.

99997599 is a deficient number, since it is larger than the sum of its proper divisors (49799265).

99997599 is a wasteful number, since it uses less digits than its factorization.

99997599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927.

The product of its digits is 18600435, while the sum is 66.

The square root of 99997599 is about 9999.8799492794. The cubic root of 99997599 is about 464.1551685133.

The spelling of 99997599 in words is "ninety-nine million, nine hundred ninety-seven thousand, five hundred ninety-nine".