100809591 has 8 divisors (see below), whose sum is σ = 134774640. Its totient is φ = 67025472.

The previous prime is 100809557. The next prime is 100809601. The reversal of 100809591 is 195908001.

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

It is not a de Polignac number, because 100809591 - 2⁷ = 100809463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100809521) 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, 43926 + ... + 46163.

It is an arithmetic number, because the mean of its divisors is an integer number (16846830).

Almost surely, 2^100809591 is an apocalyptic number.

100809591 is a deficient number, since it is larger than the sum of its proper divisors (33965049).

100809591 is an equidigital number, since it uses as much as digits as its factorization.

100809591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90465.

The product of its (nonzero) digits is 3240, while the sum is 33.

The square root of 100809591 is about 10040.3979502807. The cubic root of 100809591 is about 465.4081143632.

The spelling of 100809591 in words is "one hundred million, eight hundred nine thousand, five hundred ninety-one".