19648161 has 24 divisors (see below), whose sum is σ = 31076136. Its totient is φ = 11888640.

The previous prime is 19648159. The next prime is 19648163. The reversal of 19648161 is 16184691.

It is a happy number.

19648161 is a `hidden beast` number, since 1 + 9 + 648 + 1 + 6 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (19648159) and next prime (19648163).

It can be written as a sum of positive squares in 4 ways, for example, as 463761 + 19184400 = 681^2 + 4380^2 .

It is not a de Polignac number, because 19648161 - 2¹ = 19648159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19648163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5761 + ... + 8513.

It is an arithmetic number, because the mean of its divisors is an integer number (1294839).

Almost surely, 2^19648161 is an apocalyptic number.

It is an amenable number.

19648161 is a deficient number, since it is larger than the sum of its proper divisors (11427975).

19648161 is a wasteful number, since it uses less digits than its factorization.

19648161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2833 (or 2830 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 19648161 is about 4432.6246175376. The cubic root of 19648161 is about 269.8406055085.

The spelling of 19648161 in words is "nineteen million, six hundred forty-eight thousand, one hundred sixty-one".