11681791 has 8 divisors (see below), whose sum is σ = 12797568. Its totient is φ = 10575000.

The previous prime is 11681779. The next prime is 11681801. The reversal of 11681791 is 19718611.

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 11681791 - 2¹⁵ = 11649023 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 (11681731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 646 + ... + 4876.

It is an arithmetic number, because the mean of its divisors is an integer number (1599696).

Almost surely, 2^11681791 is an apocalyptic number.

11681791 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11681791 is a deficient number, since it is larger than the sum of its proper divisors (1115777).

11681791 is a wasteful number, since it uses less digits than its factorization.

11681791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4493.

The product of its digits is 3024, while the sum is 34.

The square root of 11681791 is about 3417.8635139514. The cubic root of 11681791 is about 226.9010352179.

The spelling of 11681791 in words is "eleven million, six hundred eighty-one thousand, seven hundred ninety-one".