1161589778 has 16 divisors (see below), whose sum is σ = 1842462720. Its totient is φ = 548349600.

The previous prime is 1161589721. The next prime is 1161589823. The reversal of 1161589778 is 8779851611.

It is an unprimeable number.

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, 225938 + ... + 231021.

It is an arithmetic number, because the mean of its divisors is an integer number (115153920).

Almost surely, 2^1161589778 is an apocalyptic number.

1161589778 is a deficient number, since it is larger than the sum of its proper divisors (680872942).

1161589778 is a wasteful number, since it uses less digits than its factorization.

1161589778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457033.

The product of its digits is 846720, while the sum is 53.

The square root of 1161589778 is about 34082.1034855538. The cubic root of 1161589778 is about 1051.1973575927.

The spelling of 1161589778 in words is "one billion, one hundred sixty-one million, five hundred eighty-nine thousand, seven hundred seventy-eight".