11787851 has 4 divisors (see below), whose sum is σ = 12481272. Its totient is φ = 11094432.

The previous prime is 11787767. The next prime is 11787857. The reversal of 11787851 is 15878711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15878711 = 137 ⋅115903.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11787851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11787857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346685 + ... + 346718.

It is an arithmetic number, because the mean of its divisors is an integer number (3120318).

Almost surely, 2^11787851 is an apocalyptic number.

11787851 is a deficient number, since it is larger than the sum of its proper divisors (693421).

11787851 is an equidigital number, since it uses as much as digits as its factorization.

11787851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693420.

The product of its digits is 15680, while the sum is 38.

The square root of 11787851 is about 3433.3439967472. The cubic root of 11787851 is about 227.5856522471.

It can be divided in two parts, 117878 and 51, that multiplied together give a triangular number (6011778 = T₃₄₆₇).

The spelling of 11787851 in words is "eleven million, seven hundred eighty-seven thousand, eight hundred fifty-one".