1131640809 has 16 divisors (see below), whose sum is σ = 1626801792. Its totient is φ = 695587968.

The previous prime is 1131640801. The next prime is 1131640823. The reversal of 1131640809 is 9080461311.

It is not a de Polignac number, because 1131640809 - 2³ = 1131640801 is a prime.

It is a super-2 number, since 2×1131640809² = 2561221841188348962, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1131640809.

It is not an unprimeable number, because it can be changed into a prime (1131640801) 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 15 ways as a sum of consecutive naturals, for example, 18237 + ... + 50949.

It is an arithmetic number, because the mean of its divisors is an integer number (101675112).

Almost surely, 2^1131640809 is an apocalyptic number.

It is an amenable number.

1131640809 is a deficient number, since it is larger than the sum of its proper divisors (495160983).

1131640809 is a wasteful number, since it uses less digits than its factorization.

1131640809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33616.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 1131640809 is about 33639.8693368449. The cubic root of 1131640809 is about 1042.0843334791.

It can be divided in two parts, 11316 and 40809, that added together give a palindrome (52125).

The spelling of 1131640809 in words is "one billion, one hundred thirty-one million, six hundred forty thousand, eight hundred nine".