991330711 has 16 divisors (see below), whose sum is σ = 1166918400. Its totient is φ = 841739640.

The previous prime is 991330699. The next prime is 991330723. The reversal of 991330711 is 117033199.

991330711 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (991330699) and next prime (991330723).

It is not a de Polignac number, because 991330711 - 2¹⁹ = 990806423 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 (991330211) 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, 23196 + ... + 50206.

It is an arithmetic number, because the mean of its divisors is an integer number (72932400).

Almost surely, 2^991330711 is an apocalyptic number.

991330711 is a deficient number, since it is larger than the sum of its proper divisors (175587689).

991330711 is a wasteful number, since it uses less digits than its factorization.

991330711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27139 (or 27125 counting only the distinct ones).

The product of its (nonzero) digits is 5103, while the sum is 34.

The square root of 991330711 is about 31485.4047298109. The cubic root of 991330711 is about 997.1018458165.

The spelling of 991330711 in words is "nine hundred ninety-one million, three hundred thirty thousand, seven hundred eleven".