891100117 has 4 divisors (see below), whose sum is σ = 891518080. Its totient is φ = 890682156.

The previous prime is 891100087. The next prime is 891100153. The reversal of 891100117 is 711001198.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 891100117 - 2²⁷ = 756882389 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 (891100157) 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 3 ways as a sum of consecutive naturals, for example, 205767 + ... + 210052.

It is an arithmetic number, because the mean of its divisors is an integer number (222879520).

Almost surely, 2^891100117 is an apocalyptic number.

It is an amenable number.

891100117 is a deficient number, since it is larger than the sum of its proper divisors (417963).

891100117 is a wasteful number, since it uses less digits than its factorization.

891100117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417962.

The product of its (nonzero) digits is 504, while the sum is 28.

The square root of 891100117 is about 29851.3000889409. The cubic root of 891100117 is about 962.2963390310.

The spelling of 891100117 in words is "eight hundred ninety-one million, one hundred thousand, one hundred seventeen".