2161584826 has 4 divisors (see below), whose sum is σ = 3242377242. Its totient is φ = 1080792412.

The previous prime is 2161584811. The next prime is 2161584857. The reversal of 2161584826 is 6284851612.

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., 1673219025 + 488365801 = 40905^2 + 22099^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 540396205 + ... + 540396208.

Almost surely, 2^2161584826 is an apocalyptic number.

2161584826 is a deficient number, since it is larger than the sum of its proper divisors (1080792416).

2161584826 is a wasteful number, since it uses less digits than its factorization.

2161584826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080792415.

The product of its digits is 184320, while the sum is 43.

The square root of 2161584826 is about 46492.8470412385. The cubic root of 2161584826 is about 1292.9768852585.

The spelling of 2161584826 in words is "two billion, one hundred sixty-one million, five hundred eighty-four thousand, eight hundred twenty-six".