11801851 has 4 divisors (see below), whose sum is σ = 11811400. Its totient is φ = 11792304.

The previous prime is 11801827. The next prime is 11801861. The reversal of 11801851 is 15810811.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 11801851 - 2¹¹ = 11799803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11801821) 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, 2586 + ... + 5503.

It is an arithmetic number, because the mean of its divisors is an integer number (2952850).

Almost surely, 2^11801851 is an apocalyptic number.

11801851 is a deficient number, since it is larger than the sum of its proper divisors (9549).

11801851 is an equidigital number, since it uses as much as digits as its factorization.

11801851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9548.

The product of its (nonzero) digits is 320, while the sum is 25.

The square root of 11801851 is about 3435.3822203650. The cubic root of 11801851 is about 227.6757149901.

The spelling of 11801851 in words is "eleven million, eight hundred one thousand, eight hundred fifty-one".