100129991 has 8 divisors (see below), whose sum is σ = 108037104. Its totient is φ = 92252160.

The previous prime is 100129987. The next prime is 100129993. The reversal of 100129991 is 199921001.

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

It is not a de Polignac number, because 100129991 - 2² = 100129987 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 (100129993) 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 7 ways as a sum of consecutive naturals, for example, 71 + ... + 14151.

It is an arithmetic number, because the mean of its divisors is an integer number (13504638).

Almost surely, 2^100129991 is an apocalyptic number.

100129991 is a deficient number, since it is larger than the sum of its proper divisors (7907113).

100129991 is a wasteful number, since it uses less digits than its factorization.

100129991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14641.

The product of its (nonzero) digits is 1458, while the sum is 32.

The square root of 100129991 is about 10006.4974391642. The cubic root of 100129991 is about 464.3599178689.

The spelling of 100129991 in words is "one hundred million, one hundred twenty-nine thousand, nine hundred ninety-one".