10091909 has 2 divisors, whose sum is σ = 10091910. Its totient is φ = 10091908.

The previous prime is 10091899. The next prime is 10091911. The reversal of 10091909 is 90919001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8282884 + 1809025 = 2878^2 + 1345^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10091909 is a prime.

It is a Sophie Germain prime.

Together with 10091911, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10091989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5045954 + 5045955.

It is an arithmetic number, because the mean of its divisors is an integer number (5045955).

Almost surely, 2^10091909 is an apocalyptic number.

It is an amenable number.

10091909 is a deficient number, since it is larger than the sum of its proper divisors (1).

10091909 is an equidigital number, since it uses as much as digits as its factorization.

10091909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 729, while the sum is 29.

The square root of 10091909 is about 3176.7765108676. The cubic root of 10091909 is about 216.1014969386.

It can be divided in two parts, 10091 and 909, that multiplied together give a palindrome (9172719).

The spelling of 10091909 in words is "ten million, ninety-one thousand, nine hundred nine".