1181818313 has 4 divisors (see below), whose sum is σ = 1272727428. Its totient is φ = 1090909200.

The previous prime is 1181818289. The next prime is 1181818343. The reversal of 1181818313 is 3138181811.

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

It can be written as a sum of positive squares in 2 ways, for example, as 348456889 + 833361424 = 18667^2 + 28868^2 .

It is a cyclic number.

It is not a de Polignac number, because 1181818313 - 2¹⁸ = 1181556169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1181818343) 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, 45454538 + ... + 45454563.

It is an arithmetic number, because the mean of its divisors is an integer number (318181857).

Almost surely, 2^1181818313 is an apocalyptic number.

1181818313 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1181818313 is a deficient number, since it is larger than the sum of its proper divisors (90909115).

1181818313 is an equidigital number, since it uses as much as digits as its factorization.

1181818313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90909114.

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

The square root of 1181818313 is about 34377.5844555722. The cubic root of 1181818313 is about 1057.2643094652.

The spelling of 1181818313 in words is "one billion, one hundred eighty-one million, eight hundred eighteen thousand, three hundred thirteen".