11556749 has 4 divisors (see below), whose sum is σ = 11664864. Its totient is φ = 11448636.

The previous prime is 11556737. The next prime is 11556757. The reversal of 11556749 is 94765511.

11556749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94765511 = 3877 ⋅24443.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11556749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11556709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53897 + ... + 54110.

It is an arithmetic number, because the mean of its divisors is an integer number (2916216).

Almost surely, 2^11556749 is an apocalyptic number.

It is an amenable number.

11556749 is a deficient number, since it is larger than the sum of its proper divisors (108115).

11556749 is a wasteful number, since it uses less digits than its factorization.

11556749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108114.

The product of its digits is 37800, while the sum is 38.

The square root of 11556749 is about 3399.5218781470. The cubic root of 11556749 is about 226.0885457198.

The spelling of 11556749 in words is "eleven million, five hundred fifty-six thousand, seven hundred forty-nine".