100900091 has 4 divisors (see below), whose sum is σ = 100922184. Its totient is φ = 100878000.

The previous prime is 100900081. The next prime is 100900099. The reversal of 100900091 is 190009001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 100900091 - 2¹⁴ = 100883707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100900099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1370 + ... + 14271.

It is an arithmetic number, because the mean of its divisors is an integer number (25230546).

Almost surely, 2^100900091 is an apocalyptic number.

100900091 is a deficient number, since it is larger than the sum of its proper divisors (22093).

100900091 is an equidigital number, since it uses as much as digits as its factorization.

100900091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22092.

The product of its (nonzero) digits is 81, while the sum is 20.

The square root of 100900091 is about 10044.9037327393. The cubic root of 100900091 is about 465.5473433004.

Adding to 100900091 its reverse (190009001), we get a palindrome (290909092).

The spelling of 100900091 in words is "one hundred million, nine hundred thousand, ninety-one".