1131731326818 has 24 divisors (see below), whose sum is σ = 2452105094400. Its totient is φ = 377240613624.

The previous prime is 1131731326811. The next prime is 1131731326819. The reversal of 1131731326818 is 8186231371311.

1131731326818 is a `hidden beast` number, since 1 + 1 + 317 + 3 + 1 + 326 + 8 + 1 + 8 = 666.

It is a super-2 number, since 2×1131731326818² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1131731326811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3113103 + ... + 3457581.

It is an arithmetic number, because the mean of its divisors is an integer number (102171045600).

Almost surely, 2^{1131731326818} is an apocalyptic number.

1131731326818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1131731326818 is an abundant number, since it is smaller than the sum of its proper divisors (1320373767582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1131731326818 is a wasteful number, since it uses less digits than its factorization.

1131731326818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527006 (or 527003 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The spelling of 1131731326818 in words is "one trillion, one hundred thirty-one billion, seven hundred thirty-one million, three hundred twenty-six thousand, eight hundred eighteen".