99381331915 has 4 divisors (see below), whose sum is σ = 119257598304. Its totient is φ = 79505065528.

The previous prime is 99381331913. The next prime is 99381331921. The reversal of 99381331915 is 51913318399.

It is a happy number.

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 99381331915 - 2¹ = 99381331913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99381331913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9938133187 + ... + 9938133196.

It is an arithmetic number, because the mean of its divisors is an integer number (29814399576).

Almost surely, 2^99381331915 is an apocalyptic number.

99381331915 is a deficient number, since it is larger than the sum of its proper divisors (19876266389).

99381331915 is a wasteful number, since it uses less digits than its factorization.

99381331915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19876266388.

The product of its digits is 787320, while the sum is 52.

The spelling of 99381331915 in words is "ninety-nine billion, three hundred eighty-one million, three hundred thirty-one thousand, nine hundred fifteen".