2159689306 has 4 divisors (see below), whose sum is σ = 3239533962. Its totient is φ = 1079844652.

The previous prime is 2159689253. The next prime is 2159689361. The reversal of 2159689306 is 6039869512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1153213681 + 1006475625 = 33959^2 + 31725^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 2159689306.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 539922325 + ... + 539922328.

Almost surely, 2^2159689306 is an apocalyptic number.

2159689306 is a deficient number, since it is larger than the sum of its proper divisors (1079844656).

2159689306 is a wasteful number, since it uses less digits than its factorization.

2159689306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079844655.

The product of its (nonzero) digits is 699840, while the sum is 49.

The square root of 2159689306 is about 46472.4574990391. The cubic root of 2159689306 is about 1292.5988323499.

The spelling of 2159689306 in words is "two billion, one hundred fifty-nine million, six hundred eighty-nine thousand, three hundred six".