1131044531551 has 16 divisors (see below), whose sum is σ = 1269097753248. Its totient is φ = 998945740800.

The previous prime is 1131044531521. The next prime is 1131044531569. The reversal of 1131044531551 is 1551354401311.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1131044531551 - 2¹⁹ = 1131044007263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131044531521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1790710 + ... + 2338531.

It is an arithmetic number, because the mean of its divisors is an integer number (79318609578).

Almost surely, 2^{1131044531551} is an apocalyptic number.

1131044531551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1131044531551 is a deficient number, since it is larger than the sum of its proper divisors (138053221697).

1131044531551 is a wasteful number, since it uses less digits than its factorization.

1131044531551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4129962.

The product of its (nonzero) digits is 18000, while the sum is 34.

Adding to 1131044531551 its reverse (1551354401311), we get a palindrome (2682398932862).

The spelling of 1131044531551 in words is "one trillion, one hundred thirty-one billion, forty-four million, five hundred thirty-one thousand, five hundred fifty-one".