11997611 has 2 divisors, whose sum is σ = 11997612. Its totient is φ = 11997610.

The previous prime is 11997599. The next prime is 11997613. The reversal of 11997611 is 11679911.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11997611 - 2⁶ = 11997547 is a prime.

Together with 11997613, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11997613) 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 as a sum of consecutive naturals, namely, 5998805 + 5998806.

It is an arithmetic number, because the mean of its divisors is an integer number (5998806).

Almost surely, 2^11997611 is an apocalyptic number.

11997611 is a deficient number, since it is larger than the sum of its proper divisors (1).

11997611 is an equidigital number, since it uses as much as digits as its factorization.

11997611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3402, while the sum is 35.

The square root of 11997611 is about 3463.7567755257. The cubic root of 11997611 is about 228.9276546005.

The spelling of 11997611 in words is "eleven million, nine hundred ninety-seven thousand, six hundred eleven".