11505121 has 2 divisors, whose sum is σ = 11505122. Its totient is φ = 11505120.

The previous prime is 11505071. The next prime is 11505157. The reversal of 11505121 is 12150511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9388096 + 2117025 = 3064^2 + 1455^2 .

It is a cyclic number.

It is not a de Polignac number, because 11505121 - 2⁹ = 11504609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11505095 and 11505104.

It is not a weakly prime, because it can be changed into another prime (11505161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5752560 + 5752561.

It is an arithmetic number, because the mean of its divisors is an integer number (5752561).

Almost surely, 2^11505121 is an apocalyptic number.

It is an amenable number.

11505121 is a deficient number, since it is larger than the sum of its proper divisors (1).

11505121 is an equidigital number, since it uses as much as digits as its factorization.

11505121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50, while the sum is 16.

The square root of 11505121 is about 3391.9199577820. The cubic root of 11505121 is about 225.7513711849.

Adding to 11505121 its reverse (12150511), we get a palindrome (23655632).

The spelling of 11505121 in words is "eleven million, five hundred five thousand, one hundred twenty-one".