1163978989 has 8 divisors (see below), whose sum is σ = 1175483448. Its totient is φ = 1152518400.

The previous prime is 1163978953. The next prime is 1163979029. The reversal of 1163978989 is 9898793611.

It can be written as a sum of positive squares in 4 ways, for example, as 152102889 + 1011876100 = 12333^2 + 31810^2 .

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 1163978989 - 2⁷ = 1163978861 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 (1163978939) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43689 + ... + 65089.

It is an arithmetic number, because the mean of its divisors is an integer number (146935431).

Almost surely, 2^1163978989 is an apocalyptic number.

It is an amenable number.

1163978989 is a deficient number, since it is larger than the sum of its proper divisors (11504459).

1163978989 is a wasteful number, since it uses less digits than its factorization.

1163978989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21935.

The product of its digits is 5878656, while the sum is 61.

The square root of 1163978989 is about 34117.1362954161. The cubic root of 1163978989 is about 1051.9175809618.

The spelling of 1163978989 in words is "one billion, one hundred sixty-three million, nine hundred seventy-eight thousand, nine hundred eighty-nine".