99911791 has 16 divisors (see below), whose sum is σ = 118325248. Its totient is φ = 82555200.

The previous prime is 99911783. The next prime is 99911809. The reversal of 99911791 is 19711999.

It is a happy number.

It is not a de Polignac number, because 99911791 - 2³ = 99911783 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 (99911741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67186 + ... + 68656.

It is an arithmetic number, because the mean of its divisors is an integer number (7395328).

Almost surely, 2^99911791 is an apocalyptic number.

99911791 is a deficient number, since it is larger than the sum of its proper divisors (18413457).

99911791 is a wasteful number, since it uses less digits than its factorization.

99911791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1822.

The product of its digits is 45927, while the sum is 46.

The square root of 99911791 is about 9995.5885769673. The cubic root of 99911791 is about 464.0223665769.

The spelling of 99911791 in words is "ninety-nine million, nine hundred eleven thousand, seven hundred ninety-one".