991202111012101 has 2 divisors, whose sum is σ = 991202111012102. Its totient is φ = 991202111012100.

The previous prime is 991202111012033. The next prime is 991202111012177. The reversal of 991202111012101 is 101210111202199.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 506013822552001 + 485188288460100 = 22494751^2 + 22026990^2 .

It is a cyclic number.

It is not a de Polignac number, because 991202111012101 - 2²⁷ = 991201976794373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (991202111012401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495601055506050 + 495601055506051.

It is an arithmetic number, because the mean of its divisors is an integer number (495601055506051).

Almost surely, 2^{991202111012101} is an apocalyptic number.

It is an amenable number.

991202111012101 is a deficient number, since it is larger than the sum of its proper divisors (1).

991202111012101 is an equidigital number, since it uses as much as digits as its factorization.

991202111012101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 31.

The spelling of 991202111012101 in words is "nine hundred ninety-one trillion, two hundred two billion, one hundred eleven million, twelve thousand, one hundred one".