2159431684 has 6 divisors (see below), whose sum is σ = 3779005454. Its totient is φ = 1079715840.

The previous prime is 2159431679. The next prime is 2159431691. The reversal of 2159431684 is 4861349512.

It can be written as a sum of positive squares in only one way, i.e., 1615236100 + 544195584 = 40190^2 + 23328^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2159431684.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269928957 + ... + 269928964.

Almost surely, 2^2159431684 is an apocalyptic number.

It is an amenable number.

2159431684 is a deficient number, since it is larger than the sum of its proper divisors (1619573770).

2159431684 is a wasteful number, since it uses less digits than its factorization.

2159431684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539857925 (or 539857923 counting only the distinct ones).

The product of its digits is 207360, while the sum is 43.

The square root of 2159431684 is about 46469.6856455905. The cubic root of 2159431684 is about 1292.5474337317.

The spelling of 2159431684 in words is "two billion, one hundred fifty-nine million, four hundred thirty-one thousand, six hundred eighty-four".