11661329 has 4 divisors (see below), whose sum is σ = 11674176. Its totient is φ = 11648484.

The previous prime is 11661323. The next prime is 11661347. The reversal of 11661329 is 92316611.

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 11661329 - 2⁸ = 11661073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11661323) 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, 4949 + ... + 6914.

It is an arithmetic number, because the mean of its divisors is an integer number (2918544).

Almost surely, 2^11661329 is an apocalyptic number.

It is an amenable number.

11661329 is a deficient number, since it is larger than the sum of its proper divisors (12847).

11661329 is an equidigital number, since it uses as much as digits as its factorization.

11661329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12846.

The product of its digits is 1944, while the sum is 29.

The square root of 11661329 is about 3414.8688115358. The cubic root of 11661329 is about 226.7684767072.

The spelling of 11661329 in words is "eleven million, six hundred sixty-one thousand, three hundred twenty-nine".