19713601 has 4 divisors (see below), whose sum is σ = 19916932. Its totient is φ = 19510272.

The previous prime is 19713587. The next prime is 19713619. The reversal of 19713601 is 10631791.

It is a Cunningham number, because it is equal to 4440²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8856576 + 10857025 = 2976^2 + 3295^2 .

It is a cyclic number.

It is not a de Polignac number, because 19713601 - 2¹¹ = 19711553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19713601.

It is not an unprimeable number, because it can be changed into a prime (19713101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101520 + ... + 101713.

It is an arithmetic number, because the mean of its divisors is an integer number (4979233).

Almost surely, 2^19713601 is an apocalyptic number.

It is an amenable number.

19713601 is a deficient number, since it is larger than the sum of its proper divisors (203331).

19713601 is an equidigital number, since it uses as much as digits as its factorization.

19713601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203330.

The product of its (nonzero) digits is 1134, while the sum is 28.

The square root of 19713601 is about 4440.0001126126. Note that the first 3 decimals coincide. The cubic root of 19713601 is about 270.1398498185.

The spelling of 19713601 in words is "nineteen million, seven hundred thirteen thousand, six hundred one".