11619991 has 8 divisors (see below), whose sum is σ = 12332160. Its totient is φ = 10925112.

The previous prime is 11619977. The next prime is 11620003. The reversal of 11619991 is 19991611.

11619991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 11619991 - 2⁹ = 11619479 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11619991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11619901) 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, 2925 + ... + 5638.

It is an arithmetic number, because the mean of its divisors is an integer number (1541520).

Almost surely, 2^11619991 is an apocalyptic number.

11619991 is a deficient number, since it is larger than the sum of its proper divisors (712169).

11619991 is an equidigital number, since it uses as much as digits as its factorization.

11619991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8645.

The product of its digits is 4374, while the sum is 37.

The square root of 11619991 is about 3408.8107897036. The cubic root of 11619991 is about 226.5002038570.

The spelling of 11619991 in words is "eleven million, six hundred nineteen thousand, nine hundred ninety-one".