11919661 has 8 divisors (see below), whose sum is σ = 13184024. Its totient is φ = 10704960.

The previous prime is 11919653. The next prime is 11919671. The reversal of 11919661 is 16691911.

It can be written as a sum of positive squares in 4 ways, for example, as 1454436 + 10465225 = 1206^2 + 3235^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11919661 - 2³ = 11919653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11919671) 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 in 7 ways as a sum of consecutive naturals, for example, 11910 + ... + 12871.

It is an arithmetic number, because the mean of its divisors is an integer number (1648003).

Almost surely, 2^11919661 is an apocalyptic number.

It is an amenable number.

11919661 is a deficient number, since it is larger than the sum of its proper divisors (1264363).

11919661 is a wasteful number, since it uses less digits than its factorization.

11919661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24831.

The product of its digits is 2916, while the sum is 34.

The square root of 11919661 is about 3452.4862056205. The cubic root of 11919661 is about 228.4307863028.

The spelling of 11919661 in words is "eleven million, nine hundred nineteen thousand, six hundred sixty-one".