100891391 has 8 divisors (see below), whose sum is σ = 104727168. Its totient is φ = 97092000.

The previous prime is 100891361. The next prime is 100891393. The reversal of 100891391 is 193198001.

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

It is not a de Polignac number, because 100891391 - 2¹⁰ = 100890367 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 (100891393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3380 + ... + 14601.

It is an arithmetic number, because the mean of its divisors is an integer number (13090896).

Almost surely, 2^100891391 is an apocalyptic number.

100891391 is a deficient number, since it is larger than the sum of its proper divisors (3835777).

100891391 is a wasteful number, since it uses less digits than its factorization.

100891391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18193.

The product of its (nonzero) digits is 1944, while the sum is 32.

The square root of 100891391 is about 10044.4706679845. The cubic root of 100891391 is about 465.5339624790.

The spelling of 100891391 in words is "one hundred million, eight hundred ninety-one thousand, three hundred ninety-one".