11691641 has 16 divisors (see below), whose sum is σ = 13063680. Its totient is φ = 10395840.

The previous prime is 11691587. The next prime is 11691643. The reversal of 11691641 is 14619611.

It is not a de Polignac number, because 11691641 - 2¹⁸ = 11429497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11691643) 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 15 ways as a sum of consecutive naturals, for example, 48800 + ... + 49038.

It is an arithmetic number, because the mean of its divisors is an integer number (816480).

Almost surely, 2^11691641 is an apocalyptic number.

It is an amenable number.

11691641 is a deficient number, since it is larger than the sum of its proper divisors (1372039).

11691641 is a wasteful number, since it uses less digits than its factorization.

11691641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376.

The product of its digits is 1296, while the sum is 29.

The square root of 11691641 is about 3419.3041689794. The cubic root of 11691641 is about 226.9647910615.

The spelling of 11691641 in words is "eleven million, six hundred ninety-one thousand, six hundred forty-one".