11719997 has 2 divisors, whose sum is σ = 11719998. Its totient is φ = 11719996.

The previous prime is 11719969. The next prime is 11719999. The reversal of 11719997 is 79991711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11062276 + 657721 = 3326^2 + 811^2 .

It is an emirp because it is prime and its reverse (79991711) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11719997 - 2⁶ = 11719933 is a prime.

Together with 11719999, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11719999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5859998 + 5859999.

It is an arithmetic number, because the mean of its divisors is an integer number (5859999).

Almost surely, 2^11719997 is an apocalyptic number.

It is an amenable number.

11719997 is a deficient number, since it is larger than the sum of its proper divisors (1).

11719997 is an equidigital number, since it uses as much as digits as its factorization.

11719997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35721, while the sum is 44.

The square root of 11719997 is about 3423.4481155700. The cubic root of 11719997 is about 227.1481305272.

The spelling of 11719997 in words is "eleven million, seven hundred nineteen thousand, nine hundred ninety-seven".