2161438706 has 12 divisors (see below), whose sum is σ = 3771490158. Its totient is φ = 926330832.

The previous prime is 2161438673. The next prime is 2161438711. The reversal of 2161438706 is 6078341612.

It can be written as a sum of positive squares in only one way, i.e., 1539385225 + 622053481 = 39235^2 + 24941^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2161438706.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11027651 + ... + 11027846.

Almost surely, 2^2161438706 is an apocalyptic number.

2161438706 is a deficient number, since it is larger than the sum of its proper divisors (1610051452).

2161438706 is a wasteful number, since it uses less digits than its factorization.

2161438706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22055513 (or 22055506 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 2161438706 is about 46491.2755901578. The cubic root of 2161438706 is about 1292.9477501477.

The spelling of 2161438706 in words is "two billion, one hundred sixty-one million, four hundred thirty-eight thousand, seven hundred six".