11721679 has 2 divisors, whose sum is σ = 11721680. Its totient is φ = 11721678.

The previous prime is 11721673. The next prime is 11721691. The reversal of 11721679 is 97612711.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11721679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11721673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5860839 + 5860840.

It is an arithmetic number, because the mean of its divisors is an integer number (5860840).

Almost surely, 2^11721679 is an apocalyptic number.

11721679 is a deficient number, since it is larger than the sum of its proper divisors (1).

11721679 is an equidigital number, since it uses as much as digits as its factorization.

11721679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5292, while the sum is 34.

The square root of 11721679 is about 3423.6937655112. The cubic root of 11721679 is about 227.1589964253.

The spelling of 11721679 in words is "eleven million, seven hundred twenty-one thousand, six hundred seventy-nine".