104891909 has 2 divisors, whose sum is σ = 104891910. Its totient is φ = 104891908.

The previous prime is 104891893. The next prime is 104891923. The reversal of 104891909 is 909198401.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97574884 + 7317025 = 9878^2 + 2705^2 .

It is a cyclic number.

It is not a de Polignac number, because 104891909 - 2⁴ = 104891893 is a prime.

It is a super-4 number, since 4×104891909⁴ (a number of 33 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (104891939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52445954 + 52445955.

It is an arithmetic number, because the mean of its divisors is an integer number (52445955).

Almost surely, 2^104891909 is an apocalyptic number.

It is an amenable number.

104891909 is a deficient number, since it is larger than the sum of its proper divisors (1).

104891909 is an equidigital number, since it uses as much as digits as its factorization.

104891909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 104891909 is about 10241.6751071297. The cubic root of 104891909 is about 471.6074566526.

The spelling of 104891909 in words is "one hundred four million, eight hundred ninety-one thousand, nine hundred nine".