99313991 has 4 divisors (see below), whose sum is σ = 113501712. Its totient is φ = 85126272.

The previous prime is 99313967. The next prime is 99313999. The reversal of 99313991 is 19931399.

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

It is not a de Polignac number, because 99313991 - 2⁶ = 99313927 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 (99313999) 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, 7093850 + ... + 7093863.

It is an arithmetic number, because the mean of its divisors is an integer number (28375428).

Almost surely, 2^99313991 is an apocalyptic number.

99313991 is a deficient number, since it is larger than the sum of its proper divisors (14187721).

99313991 is a wasteful number, since it uses less digits than its factorization.

99313991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14187720.

The product of its digits is 59049, while the sum is 44.

The square root of 99313991 is about 9965.6405213112. The cubic root of 99313991 is about 463.0950564191.

The spelling of 99313991 in words is "ninety-nine million, three hundred thirteen thousand, nine hundred ninety-one".