1338181811 has 4 divisors (see below), whose sum is σ = 1338294672. Its totient is φ = 1338068952.

The previous prime is 1338181787. The next prime is 1338181813. The reversal of 1338181811 is 1181818331.

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 1338181811 - 2¹⁰ = 1338180787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1338181813) 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, 36236 + ... + 63161.

It is an arithmetic number, because the mean of its divisors is an integer number (334573668).

Almost surely, 2^1338181811 is an apocalyptic number.

1338181811 is a deficient number, since it is larger than the sum of its proper divisors (112861).

1338181811 is an equidigital number, since it uses as much as digits as its factorization.

1338181811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112860.

The product of its digits is 4608, while the sum is 35.

The square root of 1338181811 is about 36581.1674362643. The cubic root of 1338181811 is about 1101.9749125001.

The spelling of 1338181811 in words is "one billion, three hundred thirty-eight million, one hundred eighty-one thousand, eight hundred eleven".