11531866 has 4 divisors (see below), whose sum is σ = 17297802. Its totient is φ = 5765932.

The previous prime is 11531843. The next prime is 11531881. The reversal of 11531866 is 66813511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66813511 = 2897 ⋅23063.

It can be written as a sum of positive squares in only one way, i.e., 9765625 + 1766241 = 3125^2 + 1329^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2882965 + ... + 2882968.

Almost surely, 2^11531866 is an apocalyptic number.

11531866 is a deficient number, since it is larger than the sum of its proper divisors (5765936).

11531866 is an equidigital number, since it uses as much as digits as its factorization.

11531866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5765935.

The product of its digits is 4320, while the sum is 31.

The square root of 11531866 is about 3395.8601266837. The cubic root of 11531866 is about 225.9261643051.

The spelling of 11531866 in words is "eleven million, five hundred thirty-one thousand, eight hundred sixty-six".