11967661 has 4 divisors (see below), whose sum is σ = 12028000. Its totient is φ = 11907324.

The previous prime is 11967653. The next prime is 11967671. The reversal of 11967661 is 16676911.

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 11967661 - 2³ = 11967653 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11967661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11967611) 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, 29871 + ... + 30268.

It is an arithmetic number, because the mean of its divisors is an integer number (3007000).

Almost surely, 2^11967661 is an apocalyptic number.

It is an amenable number.

11967661 is a deficient number, since it is larger than the sum of its proper divisors (60339).

11967661 is an equidigital number, since it uses as much as digits as its factorization.

11967661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60338.

The product of its digits is 13608, while the sum is 37.

The square root of 11967661 is about 3459.4307335167. The cubic root of 11967661 is about 228.7370028548.

The spelling of 11967661 in words is "eleven million, nine hundred sixty-seven thousand, six hundred sixty-one".