1191065043 has 32 divisors (see below), whose sum is σ = 1891123200. Its totient is φ = 652459680.

The previous prime is 1191064997. The next prime is 1191065063. The reversal of 1191065043 is 3405601911.

It is not a de Polignac number, because 1191065043 - 2⁹ = 1191064531 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1191065043.

It is not an unprimeable number, because it can be changed into a prime (1191065063) 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 31 ways as a sum of consecutive naturals, for example, 61108 + ... + 78206.

It is an arithmetic number, because the mean of its divisors is an integer number (59097600).

Almost surely, 2^1191065043 is an apocalyptic number.

1191065043 is a deficient number, since it is larger than the sum of its proper divisors (700058157).

1191065043 is a wasteful number, since it uses less digits than its factorization.

1191065043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17247.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 1191065043 is about 34511.8101959315. The cubic root of 1191065043 is about 1060.0145491654.

Adding to 1191065043 its reverse (3405601911), we get a palindrome (4596666954).

The spelling of 1191065043 in words is "one billion, one hundred ninety-one million, sixty-five thousand, forty-three".