1131206043 has 16 divisors (see below), whose sum is σ = 1645955712. Its totient is φ = 685344000.

The previous prime is 1131206039. The next prime is 1131206077. The reversal of 1131206043 is 3406021311.

It is not a de Polignac number, because 1131206043 - 2² = 1131206039 is a prime.

It is a super-2 number, since 2×1131206043² = 2559254223439435698, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1131206023) 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 15 ways as a sum of consecutive naturals, for example, 171028 + ... + 177518.

It is an arithmetic number, because the mean of its divisors is an integer number (102872232).

Almost surely, 2^1131206043 is an apocalyptic number.

1131206043 is a deficient number, since it is larger than the sum of its proper divisors (514749669).

1131206043 is a wasteful number, since it uses less digits than its factorization.

1131206043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11786.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1131206043 is about 33633.4066517205. The cubic root of 1131206043 is about 1041.9508633100.

Adding to 1131206043 its reverse (3406021311), we get a palindrome (4537227354).

The spelling of 1131206043 in words is "one billion, one hundred thirty-one million, two hundred six thousand, forty-three".