991350911 has 4 divisors (see below), whose sum is σ = 997287312. Its totient is φ = 985414512.

The previous prime is 991350907. The next prime is 991350947. The reversal of 991350911 is 119053199.

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 991350911 - 2² = 991350907 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 (991350901) 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, 2967950 + ... + 2968283.

It is an arithmetic number, because the mean of its divisors is an integer number (249321828).

Almost surely, 2^991350911 is an apocalyptic number.

991350911 is a deficient number, since it is larger than the sum of its proper divisors (5936401).

991350911 is a wasteful number, since it uses less digits than its factorization.

991350911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5936400.

The product of its (nonzero) digits is 10935, while the sum is 38.

The square root of 991350911 is about 31485.7255117299. The cubic root of 991350911 is about 997.1086183026.

The spelling of 991350911 in words is "nine hundred ninety-one million, three hundred fifty thousand, nine hundred eleven".