991323250111 has 4 divisors (see below), whose sum is σ = 992277364000. Its totient is φ = 990369136224.

The previous prime is 991323250091. The next prime is 991323250117. The reversal of 991323250111 is 111052323199.

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 991323250111 - 2²³ = 991314861503 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 (991323250117) 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, 477055386 + ... + 477057463.

It is an arithmetic number, because the mean of its divisors is an integer number (248069341000).

Almost surely, 2^991323250111 is an apocalyptic number.

991323250111 is a deficient number, since it is larger than the sum of its proper divisors (954113889).

991323250111 is a wasteful number, since it uses less digits than its factorization.

991323250111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 954113888.

The product of its (nonzero) digits is 14580, while the sum is 37.

The spelling of 991323250111 in words is "nine hundred ninety-one billion, three hundred twenty-three million, two hundred fifty thousand, one hundred eleven".