991122002012101 has 4 divisors (see below), whose sum is σ = 991123193623104. Its totient is φ = 991120810401100.

The previous prime is 991122002011937. The next prime is 991122002012117. The reversal of 991122002012101 is 101210200221199.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 991122002012101 - 2²³ = 991121993623493 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 (991122002016101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 594557005 + ... + 596221666.

It is an arithmetic number, because the mean of its divisors is an integer number (247780798405776).

Almost surely, 2^{991122002012101} is an apocalyptic number.

It is an amenable number.

991122002012101 is a deficient number, since it is larger than the sum of its proper divisors (1191611003).

991122002012101 is a wasteful number, since it uses less digits than its factorization.

991122002012101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1191611002.

The product of its (nonzero) digits is 1296, while the sum is 31.

The spelling of 991122002012101 in words is "nine hundred ninety-one trillion, one hundred twenty-two billion, two million, twelve thousand, one hundred one".