100991743901 has 24 divisors (see below), whose sum is σ = 108159633120. Its totient is φ = 94240038816.

The previous prime is 100991743891. The next prime is 100991743967. The reversal of 100991743901 is 109347199001.

It is a happy number.

It is not a de Polignac number, because 100991743901 - 2³⁰ = 99918002077 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 (100991773901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23177015 + ... + 23181371.

It is an arithmetic number, because the mean of its divisors is an integer number (4506651380).

Almost surely, 2^100991743901 is an apocalyptic number.

It is an amenable number.

100991743901 is a deficient number, since it is larger than the sum of its proper divisors (7167889219).

100991743901 is a wasteful number, since it uses less digits than its factorization.

100991743901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5465 (or 5442 counting only the distinct ones).

The product of its (nonzero) digits is 61236, while the sum is 44.

The spelling of 100991743901 in words is "one hundred billion, nine hundred ninety-one million, seven hundred forty-three thousand, nine hundred one".