1147165991 has 8 divisors (see below), whose sum is σ = 1162210224. Its totient is φ = 1132151040.

The previous prime is 1147165961. The next prime is 1147166003. The reversal of 1147165991 is 1995617411.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1147165991 - 2⁶ = 1147165927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1147165931) 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 7 ways as a sum of consecutive naturals, for example, 77975 + ... + 91511.

It is an arithmetic number, because the mean of its divisors is an integer number (145276278).

Almost surely, 2^1147165991 is an apocalyptic number.

1147165991 is a deficient number, since it is larger than the sum of its proper divisors (15044233).

1147165991 is a wasteful number, since it uses less digits than its factorization.

1147165991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14641.

The product of its digits is 68040, while the sum is 44.

The square root of 1147165991 is about 33869.8389573969. The cubic root of 1147165991 is about 1046.8282186815.

The spelling of 1147165991 in words is "one billion, one hundred forty-seven million, one hundred sixty-five thousand, nine hundred ninety-one".