11966551 has 4 divisors (see below), whose sum is σ = 11977504. Its totient is φ = 11955600.

The previous prime is 11966543. The next prime is 11966573. The reversal of 11966551 is 15566911.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 11966551 - 2³ = 11966543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11966951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3630 + ... + 6091.

It is an arithmetic number, because the mean of its divisors is an integer number (2994376).

Almost surely, 2^11966551 is an apocalyptic number.

11966551 is a deficient number, since it is larger than the sum of its proper divisors (10953).

11966551 is an equidigital number, since it uses as much as digits as its factorization.

11966551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10952.

The product of its digits is 8100, while the sum is 34.

The square root of 11966551 is about 3459.2702987769. The cubic root of 11966551 is about 228.7299308540.

It can be divided in two parts, 119665 and 51, that added together give a square (119716 = 346²).

The spelling of 11966551 in words is "eleven million, nine hundred sixty-six thousand, five hundred fifty-one".