992991092091 has 4 divisors (see below), whose sum is σ = 1323988122792. Its totient is φ = 661994061392.

The previous prime is 992991092077. The next prime is 992991092101. The reversal of 992991092091 is 190290199299.

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 992991092091 - 2¹¹ = 992991090043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (992911092091) 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, 165498515346 + ... + 165498515351.

It is an arithmetic number, because the mean of its divisors is an integer number (330997030698).

Almost surely, 2^992991092091 is an apocalyptic number.

992991092091 is a deficient number, since it is larger than the sum of its proper divisors (330997030701).

992991092091 is a wasteful number, since it uses less digits than its factorization.

992991092091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330997030700.

The product of its (nonzero) digits is 2125764, while the sum is 60.

It can be divided in two parts, 9929910 and 92091, that added together give a palindrome (10022001).

The spelling of 992991092091 in words is "nine hundred ninety-two billion, nine hundred ninety-one million, ninety-two thousand, ninety-one".