11503661 has 12 divisors (see below), whose sum is σ = 12754368. Its totient is φ = 10365264.

The previous prime is 11503651. The next prime is 11503669. The reversal of 11503661 is 16630511.

It is a happy number.

11503661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-11503661 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 (11503669) 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, 6476 + ... + 8058.

It is an arithmetic number, because the mean of its divisors is an integer number (1062864).

Almost surely, 2^11503661 is an apocalyptic number.

It is an amenable number.

11503661 is a deficient number, since it is larger than the sum of its proper divisors (1250707).

11503661 is a wasteful number, since it uses less digits than its factorization.

11503661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1652 (or 1639 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 11503661 is about 3391.7047336111. The cubic root of 11503661 is about 225.7418214970.

The spelling of 11503661 in words is "eleven million, five hundred three thousand, six hundred sixty-one".