11913661 has 2 divisors, whose sum is σ = 11913662. Its totient is φ = 11913660.

The previous prime is 11913659. The next prime is 11913677. The reversal of 11913661 is 16631911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10208025 + 1705636 = 3195^2 + 1306^2 .

It is a cyclic number.

It is not a de Polignac number, because 11913661 - 2¹ = 11913659 is a prime.

Together with 11913659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11913611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5956830 + 5956831.

It is an arithmetic number, because the mean of its divisors is an integer number (5956831).

Almost surely, 2^11913661 is an apocalyptic number.

It is an amenable number.

11913661 is a deficient number, since it is larger than the sum of its proper divisors (1).

11913661 is an equidigital number, since it uses as much as digits as its factorization.

11913661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972, while the sum is 28.

The square root of 11913661 is about 3451.6171572178. The cubic root of 11913661 is about 228.3924514667.

The spelling of 11913661 in words is "eleven million, nine hundred thirteen thousand, six hundred sixty-one".