19882161 has 12 divisors (see below), whose sum is σ = 30927988. Its totient is φ = 12235104.

The previous prime is 19882147. The next prime is 19882199. The reversal of 19882161 is 16128891.

It can be written as a sum of positive squares in 2 ways, for example, as 6922161 + 12960000 = 2631^2 + 3600^2 .

It is not a de Polignac number, because 19882161 - 2⁷ = 19882033 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19882141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84850 + ... + 85083.

Almost surely, 2^19882161 is an apocalyptic number.

It is an amenable number.

19882161 is a deficient number, since it is larger than the sum of its proper divisors (11045827).

19882161 is a wasteful number, since it uses less digits than its factorization.

19882161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169952 (or 169949 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The square root of 19882161 is about 4458.9416905808. The cubic root of 19882161 is about 270.9076041095.

The spelling of 19882161 in words is "nineteen million, eight hundred eighty-two thousand, one hundred sixty-one".