1131544409 has 4 divisors (see below), whose sum is σ = 1180742016. Its totient is φ = 1082346804.

The previous prime is 1131544391. The next prime is 1131544451. The reversal of 1131544409 is 9044451311.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1131544409 - 2²⁰ = 1130495833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131544459) 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 3 ways as a sum of consecutive naturals, for example, 24598769 + ... + 24598814.

It is an arithmetic number, because the mean of its divisors is an integer number (295185504).

Almost surely, 2^1131544409 is an apocalyptic number.

It is an amenable number.

1131544409 is a deficient number, since it is larger than the sum of its proper divisors (49197607).

1131544409 is an equidigital number, since it uses as much as digits as its factorization.

1131544409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49197606.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 1131544409 is about 33638.4364826905. The cubic root of 1131544409 is about 1042.0547422927.

The spelling of 1131544409 in words is "one billion, one hundred thirty-one million, five hundred forty-four thousand, four hundred nine".