11919851 has 4 divisors (see below), whose sum is σ = 12000000. Its totient is φ = 11839704.

The previous prime is 11919847. The next prime is 11919857. The reversal of 11919851 is 15891911.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11919851 - 2² = 11919847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11919857) 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, 39851 + ... + 40148.

It is an arithmetic number, because the mean of its divisors is an integer number (3000000).

Almost surely, 2^11919851 is an apocalyptic number.

11919851 is a deficient number, since it is larger than the sum of its proper divisors (80149).

11919851 is an equidigital number, since it uses as much as digits as its factorization.

11919851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80148.

The product of its digits is 3240, while the sum is 35.

The square root of 11919851 is about 3452.5137219134. The cubic root of 11919851 is about 228.4320000291.

The spelling of 11919851 in words is "eleven million, nine hundred nineteen thousand, eight hundred fifty-one".