100000991901 has 8 divisors (see below), whose sum is σ = 134183921824. Its totient is φ = 66242694960.

The previous prime is 100000991869. The next prime is 100000991911. The reversal of 100000991901 is 109199000001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 100000991901 - 2⁵ = 100000991869 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 (100000991911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106157695 + ... + 106158636.

It is an arithmetic number, because the mean of its divisors is an integer number (16772990228).

Almost surely, 2^100000991901 is an apocalyptic number.

It is an amenable number.

100000991901 is a deficient number, since it is larger than the sum of its proper divisors (34182929923).

100000991901 is a wasteful number, since it uses less digits than its factorization.

100000991901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212316491.

The product of its (nonzero) digits is 729, while the sum is 30.

Adding to 100000991901 its reverse (109199000001), we get a palindrome (209199991902).

It can be divided in two parts, 100000 and 991901, that added together give a palindrome (1091901).

The spelling of 100000991901 in words is "one hundred billion, nine hundred ninety-one thousand, nine hundred one".