1091663243 has 16 divisors (see below), whose sum is σ = 1212443232. Its totient is φ = 974592000.

The previous prime is 1091663201. The next prime is 1091663249. The reversal of 1091663243 is 3423661901.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1091663243 - 2⁶ = 1091663179 is a prime.

It is a super-2 number, since 2×1091663243² = 2383457272234554098, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1091663249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 190703 + ... + 196343.

It is an arithmetic number, because the mean of its divisors is an integer number (75777702).

Almost surely, 2^1091663243 is an apocalyptic number.

1091663243 is a deficient number, since it is larger than the sum of its proper divisors (120779989).

1091663243 is a wasteful number, since it uses less digits than its factorization.

1091663243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5966.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 1091663243 is about 33040.3275256163. The cubic root of 1091663243 is about 1029.6656604858.

The spelling of 1091663243 in words is "one billion, ninety-one million, six hundred sixty-three thousand, two hundred forty-three".