100191089 has 2 divisors, whose sum is σ = 100191090. Its totient is φ = 100191088.

The previous prime is 100191073. The next prime is 100191103. The reversal of 100191089 is 980191001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80013025 + 20178064 = 8945^2 + 4492^2 .

It is a cyclic number.

It is not a de Polignac number, because 100191089 - 2⁴ = 100191073 is a prime.

It is not a weakly prime, because it can be changed into another prime (100191019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50095544 + 50095545.

It is an arithmetic number, because the mean of its divisors is an integer number (50095545).

Almost surely, 2^100191089 is an apocalyptic number.

It is an amenable number.

100191089 is a deficient number, since it is larger than the sum of its proper divisors (1).

100191089 is an equidigital number, since it uses as much as digits as its factorization.

100191089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 29.

The square root of 100191089 is about 10009.5498899801. The cubic root of 100191089 is about 464.4543474309.

The spelling of 100191089 in words is "one hundred million, one hundred ninety-one thousand, eighty-nine".