19683961 has 4 divisors (see below), whose sum is σ = 21473424. Its totient is φ = 17894500.

The previous prime is 19683959. The next prime is 19683973. The reversal of 19683961 is 16938691.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19683961 - 2¹ = 19683959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19683941) 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 3 ways as a sum of consecutive naturals, for example, 894715 + ... + 894736.

It is an arithmetic number, because the mean of its divisors is an integer number (5368356).

Almost surely, 2^19683961 is an apocalyptic number.

19683961 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19683961 is a deficient number, since it is larger than the sum of its proper divisors (1789463).

19683961 is a wasteful number, since it uses less digits than its factorization.

19683961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1789462.

The product of its digits is 69984, while the sum is 43.

The square root of 19683961 is about 4436.6610192802. The cubic root of 19683961 is about 270.0043940757.

It can be divided in two parts, 1968 and 3961, that added together give a square (5929 = 77²).

The spelling of 19683961 in words is "nineteen million, six hundred eighty-three thousand, nine hundred sixty-one".