1131511541 has 12 divisors (see below), whose sum is σ = 1226489292. Its totient is φ = 1042974144.

The previous prime is 1131511489. The next prime is 1131511559. The reversal of 1131511541 is 1451151311.

It can be written as a sum of positive squares in 2 ways, for example, as 959140900 + 172370641 = 30970^2 + 13129^2 .

It is not a de Polignac number, because 1131511541 - 2¹⁸ = 1131249397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131511741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29000 + ... + 55713.

It is an arithmetic number, because the mean of its divisors is an integer number (102207441).

Almost surely, 2^1131511541 is an apocalyptic number.

It is an amenable number.

1131511541 is a deficient number, since it is larger than the sum of its proper divisors (94977751).

1131511541 is an equidigital number, since it uses as much as digits as its factorization.

1131511541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84788 (or 84769 counting only the distinct ones).

The product of its digits is 300, while the sum is 23.

The square root of 1131511541 is about 33637.9479308712. The cubic root of 1131511541 is about 1042.0446526646.

Adding to 1131511541 its reverse (1451151311), we get a palindrome (2582662852).

The spelling of 1131511541 in words is "one billion, one hundred thirty-one million, five hundred eleven thousand, five hundred forty-one".