11555945 has 12 divisors (see below), whose sum is σ = 14068236. Its totient is φ = 9112320.

The previous prime is 11555941. The next prime is 11555953. The reversal of 11555945 is 54955511.

It can be written as a sum of positive squares in 6 ways, for example, as 8826841 + 2729104 = 2971^2 + 1652^2 .

It is not a de Polignac number, because 11555945 - 2² = 11555941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11555941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63755 + ... + 63935.

It is an arithmetic number, because the mean of its divisors is an integer number (1172353).

Almost surely, 2^11555945 is an apocalyptic number.

It is an amenable number.

11555945 is a deficient number, since it is larger than the sum of its proper divisors (2512291).

11555945 is an equidigital number, since it uses as much as digits as its factorization.

11555945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412 (or 299 counting only the distinct ones).

The product of its digits is 22500, while the sum is 35.

The square root of 11555945 is about 3399.4036241670. The cubic root of 11555945 is about 226.0833026246.

The spelling of 11555945 in words is "eleven million, five hundred fifty-five thousand, nine hundred forty-five".