11561513 has 8 divisors (see below), whose sum is σ = 12443400. Its totient is φ = 10702080.

The previous prime is 11561509. The next prime is 11561531. The reversal of 11561513 is 31516511.

11561513 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 218089 + 11343424 = 467^2 + 3368^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11561513 - 2² = 11561509 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11561213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4538 + ... + 6611.

It is an arithmetic number, because the mean of its divisors is an integer number (1555425).

Almost surely, 2^11561513 is an apocalyptic number.

It is an amenable number.

11561513 is a deficient number, since it is larger than the sum of its proper divisors (881887).

11561513 is a wasteful number, since it uses less digits than its factorization.

11561513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11227.

The product of its digits is 450, while the sum is 23.

The square root of 11561513 is about 3400.2224927201. Note that the first 3 decimals coincide. The cubic root of 11561513 is about 226.1196080270.

The spelling of 11561513 in words is "eleven million, five hundred sixty-one thousand, five hundred thirteen".