990110109901 has 6 divisors (see below), whose sum is σ = 1088302848206. Its totient is φ = 900100099800.

The previous prime is 990110109899. The next prime is 990110109917. The reversal of 990110109901 is 109901011099.

It can be written as a sum of positive squares in only one way, i.e., 972144728676 + 17965381225 = 985974^2 + 134035^2 .

It is not a de Polignac number, because 990110109901 - 2¹ = 990110109899 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 (990110109101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4091363970 + ... + 4091364211.

Almost surely, 2^990110109901 is an apocalyptic number.

It is an amenable number.

990110109901 is a deficient number, since it is larger than the sum of its proper divisors (98192738305).

990110109901 is a wasteful number, since it uses less digits than its factorization.

990110109901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8182728203 (or 8182728192 counting only the distinct ones).

The product of its (nonzero) digits is 6561, while the sum is 40.

It can be divided in two parts, 990110 and 109901, that added together give a palindrome (1100011).

The spelling of 990110109901 in words is "nine hundred ninety billion, one hundred ten million, one hundred nine thousand, nine hundred one".