1131243541 has 12 divisors (see below), whose sum is σ = 1152110752. Its totient is φ = 1110635568.

The previous prime is 1131243539. The next prime is 1131243593. The reversal of 1131243541 is 1453421311.

It is not a de Polignac number, because 1131243541 - 2¹ = 1131243539 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 (1131243511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3997186 + ... + 3997468.

Almost surely, 2^1131243541 is an apocalyptic number.

It is an amenable number.

1131243541 is a deficient number, since it is larger than the sum of its proper divisors (20867211).

1131243541 is an equidigital number, since it uses as much as digits as its factorization.

1131243541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780 (or 583 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 1131243541 is about 33633.9640988094. The cubic root of 1131243541 is about 1041.9623762853.

Adding to 1131243541 its reverse (1453421311), we get a palindrome (2584664852).

The spelling of 1131243541 in words is "one billion, one hundred thirty-one million, two hundred forty-three thousand, five hundred forty-one".