11801811 has 16 divisors (see below), whose sum is σ = 18604800. Its totient is φ = 6511008.

The previous prime is 11801771. The next prime is 11801821. The reversal of 11801811 is 11810811.

It is a happy number.

It is not a de Polignac number, because 11801811 - 2¹¹ = 11799763 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

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 (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9081 + ... + 10298.

It is an arithmetic number, because the mean of its divisors is an integer number (1162800).

Almost surely, 2^11801811 is an apocalyptic number.

11801811 is a deficient number, since it is larger than the sum of its proper divisors (6802989).

11801811 is a wasteful number, since it uses less digits than its factorization.

11801811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19418.

The product of its (nonzero) digits is 64, while the sum is 21.

The square root of 11801811 is about 3435.3763985916. The cubic root of 11801811 is about 227.6754577695.

The spelling of 11801811 in words is "eleven million, eight hundred one thousand, eight hundred eleven".