991201110201 has 6 divisors (see below), whose sum is σ = 1431734936970. Its totient is φ = 660800740128.

The previous prime is 991201110161. The next prime is 991201110209. The reversal of 991201110201 is 102011102199.

It can be written as a sum of positive squares in only one way, i.e., 829053954576 + 162147155625 = 910524^2 + 402675^2 .

It is a de Polignac number, because none of the positive numbers 2^k-991201110201 is a prime.

It is a super-3 number, since 3×991201110201³ (a number of 37 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (991201110209) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55066728336 + ... + 55066728353.

It is an arithmetic number, because the mean of its divisors is an integer number (238622489495).

Almost surely, 2^991201110201 is an apocalyptic number.

It is an amenable number.

991201110201 is a deficient number, since it is larger than the sum of its proper divisors (440533826769).

991201110201 is a wasteful number, since it uses less digits than its factorization.

991201110201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110133456695 (or 110133456692 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 27.

The spelling of 991201110201 in words is "nine hundred ninety-one billion, two hundred one million, one hundred ten thousand, two hundred one".