100912891 has 4 divisors (see below), whose sum is σ = 105300432. Its totient is φ = 96525352.

The previous prime is 100912879. The next prime is 100912897. The reversal of 100912891 is 198219001.

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 100912891 - 2⁵ = 100912859 is a prime.

It is a super-3 number, since 3×100912891³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100912897) 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, 2193736 + ... + 2193781.

It is an arithmetic number, because the mean of its divisors is an integer number (26325108).

Almost surely, 2^100912891 is an apocalyptic number.

100912891 is a deficient number, since it is larger than the sum of its proper divisors (4387541).

100912891 is an equidigital number, since it uses as much as digits as its factorization.

100912891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4387540.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 100912891 is about 10045.5408515420. The cubic root of 100912891 is about 465.5670286280.

The spelling of 100912891 in words is "one hundred million, nine hundred twelve thousand, eight hundred ninety-one".