11751891 has 4 divisors (see below), whose sum is σ = 15669192. Its totient is φ = 7834592.

The previous prime is 11751889. The next prime is 11751893. The reversal of 11751891 is 19815711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19815711 = 3 ⋅6605237.

It is an interprime number because it is at equal distance from previous prime (11751889) and next prime (11751893).

It is a cyclic number.

It is not a de Polignac number, because 11751891 - 2¹ = 11751889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11751893) 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 3 ways as a sum of consecutive naturals, for example, 1958646 + ... + 1958651.

It is an arithmetic number, because the mean of its divisors is an integer number (3917298).

Almost surely, 2^11751891 is an apocalyptic number.

11751891 is a deficient number, since it is larger than the sum of its proper divisors (3917301).

11751891 is an equidigital number, since it uses as much as digits as its factorization.

11751891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3917300.

The product of its digits is 2520, while the sum is 33.

The square root of 11751891 is about 3428.1031198026. The cubic root of 11751891 is about 227.3539923740.

The spelling of 11751891 in words is "eleven million, seven hundred fifty-one thousand, eight hundred ninety-one".