1191003663 has 32 divisors (see below), whose sum is σ = 1739888640. Its totient is φ = 721428480.

The previous prime is 1191003631. The next prime is 1191003679. The reversal of 1191003663 is 3663001911.

It is not a de Polignac number, because 1191003663 - 2⁵ = 1191003631 is a prime.

1191003663 is a modest number, since divided by 3663 gives 1191 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 1191003663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191003613) 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 31 ways as a sum of consecutive naturals, for example, 978031 + ... + 979247.

It is an arithmetic number, because the mean of its divisors is an integer number (54371520).

Almost surely, 2^1191003663 is an apocalyptic number.

1191003663 is a deficient number, since it is larger than the sum of its proper divisors (548884977).

1191003663 is a wasteful number, since it uses less digits than its factorization.

1191003663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1887.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 1191003663 is about 34510.9209236728. The cubic root of 1191003663 is about 1059.9963400253.

The spelling of 1191003663 in words is "one billion, one hundred ninety-one million, three thousand, six hundred sixty-three".