11555161 has 2 divisors, whose sum is σ = 11555162. Its totient is φ = 11555160.

The previous prime is 11555149. The next prime is 11555171. The reversal of 11555161 is 16155511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10465225 + 1089936 = 3235^2 + 1044^2 .

It is an emirp because it is prime and its reverse (16155511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11555161 - 2⁵ = 11555129 is a prime.

It is not a weakly prime, because it can be changed into another prime (11555171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5777580 + 5777581.

It is an arithmetic number, because the mean of its divisors is an integer number (5777581).

Almost surely, 2^11555161 is an apocalyptic number.

It is an amenable number.

11555161 is a deficient number, since it is larger than the sum of its proper divisors (1).

11555161 is an equidigital number, since it uses as much as digits as its factorization.

11555161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 750, while the sum is 25.

The square root of 11555161 is about 3399.2883078668. The cubic root of 11555161 is about 226.0781897204.

The spelling of 11555161 in words is "eleven million, five hundred fifty-five thousand, one hundred sixty-one".