11661513 has 4 divisors (see below), whose sum is σ = 15548688. Its totient is φ = 7774340.

The previous prime is 11661491. The next prime is 11661523. The reversal of 11661513 is 31516611.

11661513 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.

It is a cyclic number.

It is not a de Polignac number, because 11661513 - 2⁶ = 11661449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11661523) 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, 1943583 + ... + 1943588.

It is an arithmetic number, because the mean of its divisors is an integer number (3887172).

Almost surely, 2^11661513 is an apocalyptic number.

It is an amenable number.

11661513 is a deficient number, since it is larger than the sum of its proper divisors (3887175).

11661513 is an equidigital number, since it uses as much as digits as its factorization.

11661513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3887174.

The product of its digits is 540, while the sum is 24.

The square root of 11661513 is about 3414.8957524352. The cubic root of 11661513 is about 226.7696694009.

The spelling of 11661513 in words is "eleven million, six hundred sixty-one thousand, five hundred thirteen".