1159981778 has 6 divisors (see below), whose sum is σ = 1740044919. Its totient is φ = 579966806.

The previous prime is 1159981733. The next prime is 1159981819. The reversal of 1159981778 is 8771899511.

It can be written as a sum of positive squares in only one way, i.e., 579990889 + 579990889 = 24083^2 + 24083^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=24083.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 36125 + ... + 60207.

Almost surely, 2^1159981778 is an apocalyptic number.

1159981778 is a deficient number, since it is larger than the sum of its proper divisors (580063141).

1159981778 is an frugal number, since it uses more digits than its factorization.

1159981778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48168 (or 24085 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 56.

The square root of 1159981778 is about 34058.5052226312. The cubic root of 1159981778 is about 1050.7120726952.

The spelling of 1159981778 in words is "one billion, one hundred fifty-nine million, nine hundred eighty-one thousand, seven hundred seventy-eight".