11979651 has 4 divisors (see below), whose sum is σ = 15972872. Its totient is φ = 7986432.

The previous prime is 11979647. The next prime is 11979659. The reversal of 11979651 is 15697911.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 11979651 - 2² = 11979647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11979659) 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, 1996606 + ... + 1996611.

It is an arithmetic number, because the mean of its divisors is an integer number (3993218).

Almost surely, 2^11979651 is an apocalyptic number.

11979651 is a deficient number, since it is larger than the sum of its proper divisors (3993221).

11979651 is an equidigital number, since it uses as much as digits as its factorization.

11979651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3993220.

The product of its digits is 17010, while the sum is 39.

The square root of 11979651 is about 3461.1632437665. The cubic root of 11979651 is about 228.8133653476.

The spelling of 11979651 in words is "eleven million, nine hundred seventy-nine thousand, six hundred fifty-one".