1131821824781 has 16 divisors (see below), whose sum is σ = 1162639068480. Its totient is φ = 1101396892800.

The previous prime is 1131821824747. The next prime is 1131821824789. The reversal of 1131821824781 is 1874281281311.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1131821824781 is a prime.

It is a super-2 number, since 2×1131821824781² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131821824789) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34170230 + ... + 34203336.

It is an arithmetic number, because the mean of its divisors is an integer number (72664941780).

Almost surely, 2^{1131821824781} is an apocalyptic number.

It is an amenable number.

1131821824781 is a deficient number, since it is larger than the sum of its proper divisors (30817243699).

1131821824781 is a wasteful number, since it uses less digits than its factorization.

1131821824781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39004.

The product of its digits is 172032, while the sum is 47.

The spelling of 1131821824781 in words is "one trillion, one hundred thirty-one billion, eight hundred twenty-one million, eight hundred twenty-four thousand, seven hundred eighty-one".