11691439 has 2 divisors, whose sum is σ = 11691440. Its totient is φ = 11691438.

The previous prime is 11691419. The next prime is 11691451. The reversal of 11691439 is 93419611.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (93419611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11691439 - 2¹⁵ = 11658671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11691419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5845719 + 5845720.

It is an arithmetic number, because the mean of its divisors is an integer number (5845720).

Almost surely, 2^11691439 is an apocalyptic number.

11691439 is a deficient number, since it is larger than the sum of its proper divisors (1).

11691439 is an equidigital number, since it uses as much as digits as its factorization.

11691439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 34.

The square root of 11691439 is about 3419.2746306783. The cubic root of 11691439 is about 226.9634839410.

The spelling of 11691439 in words is "eleven million, six hundred ninety-one thousand, four hundred thirty-nine".