2159071978 has 32 divisors (see below), whose sum is σ = 3959432064. Its totient is φ = 861898752.

The previous prime is 2159071969. The next prime is 2159072021. The reversal of 2159071978 is 8791709512.

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 15 ways as a sum of consecutive naturals, for example, 23676 + ... + 69847.

It is an arithmetic number, because the mean of its divisors is an integer number (123732252).

Almost surely, 2^2159071978 is an apocalyptic number.

2159071978 is a deficient number, since it is larger than the sum of its proper divisors (1800360086).

2159071978 is a wasteful number, since it uses less digits than its factorization.

2159071978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93646.

The product of its (nonzero) digits is 317520, while the sum is 49.

The square root of 2159071978 is about 46465.8151547996. The cubic root of 2159071978 is about 1292.4756613160.

The spelling of 2159071978 in words is "two billion, one hundred fifty-nine million, seventy-one thousand, nine hundred seventy-eight".