100128889 has 4 divisors (see below), whose sum is σ = 114433024. Its totient is φ = 85824756.

The previous prime is 100128883. The next prime is 100128893. The reversal of 100128889 is 988821001.

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 100128889 - 2³ = 100128881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100128881) 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, 7152057 + ... + 7152070.

It is an arithmetic number, because the mean of its divisors is an integer number (28608256).

Almost surely, 2^100128889 is an apocalyptic number.

It is an amenable number.

100128889 is a deficient number, since it is larger than the sum of its proper divisors (14304135).

100128889 is an equidigital number, since it uses as much as digits as its factorization.

100128889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14304134.

The product of its (nonzero) digits is 9216, while the sum is 37.

The square root of 100128889 is about 10006.4423747904. The cubic root of 100128889 is about 464.3582143283.

It can be divided in two parts, 1001 and 28889, that added together give a triangular number (29890 = T₂₄₄).

The spelling of 100128889 in words is "one hundred million, one hundred twenty-eight thousand, eight hundred eighty-nine".