11581979 has 2 divisors, whose sum is σ = 11581980. Its totient is φ = 11581978.

The previous prime is 11581957. The next prime is 11581987. The reversal of 11581979 is 97918511.

11581979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11581979 - 2⁸ = 11581723 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11581079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5790989 + 5790990.

It is an arithmetic number, because the mean of its divisors is an integer number (5790990).

Almost surely, 2^11581979 is an apocalyptic number.

11581979 is a deficient number, since it is larger than the sum of its proper divisors (1).

11581979 is an equidigital number, since it uses as much as digits as its factorization.

11581979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 41.

The square root of 11581979 is about 3403.2306709948. The cubic root of 11581979 is about 226.2529537785.

The spelling of 11581979 in words is "eleven million, five hundred eighty-one thousand, nine hundred seventy-nine".