11905121 has 2 divisors, whose sum is σ = 11905122. Its totient is φ = 11905120.

The previous prime is 11905097. The next prime is 11905123. The reversal of 11905121 is 12150911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11826721 + 78400 = 3439^2 + 280^2 .

It is a cyclic number.

It is not a de Polignac number, because 11905121 - 2⁶ = 11905057 is a prime.

It is a Sophie Germain prime.

Together with 11905123, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11905093 and 11905102.

It is not a weakly prime, because it can be changed into another prime (11905123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5952560 + 5952561.

It is an arithmetic number, because the mean of its divisors is an integer number (5952561).

Almost surely, 2^11905121 is an apocalyptic number.

It is an amenable number.

11905121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11905121 is an equidigital number, since it uses as much as digits as its factorization.

11905121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90, while the sum is 20.

The square root of 11905121 is about 3450.3798341632. The cubic root of 11905121 is about 228.3378660131.

The spelling of 11905121 in words is "eleven million, nine hundred five thousand, one hundred twenty-one".