99991711 has 4 divisors (see below), whose sum is σ = 100018800. Its totient is φ = 99964624.

The previous prime is 99991687. The next prime is 99991721. The reversal of 99991711 is 11719999.

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 99991711 - 2⁷ = 99991583 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 (99991721) 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, 6931 + ... + 15748.

It is an arithmetic number, because the mean of its divisors is an integer number (25004700).

Almost surely, 2^99991711 is an apocalyptic number.

99991711 is a deficient number, since it is larger than the sum of its proper divisors (27089).

99991711 is a wasteful number, since it uses less digits than its factorization.

99991711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27088.

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

The square root of 99991711 is about 9999.5855414112. The cubic root of 99991711 is about 464.1460582970.

The spelling of 99991711 in words is "ninety-nine million, nine hundred ninety-one thousand, seven hundred eleven".