19681371 has 12 divisors (see below), whose sum is σ = 28749240. Its totient is φ = 12972960.

The previous prime is 19681369. The next prime is 19681379. The reversal of 19681371 is 17318691.

It is not a de Polignac number, because 19681371 - 2¹ = 19681369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19681379) 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 11 ways as a sum of consecutive naturals, for example, 11485 + ... + 13086.

It is an arithmetic number, because the mean of its divisors is an integer number (2395770).

Almost surely, 2^19681371 is an apocalyptic number.

19681371 is a deficient number, since it is larger than the sum of its proper divisors (9067869).

19681371 is a wasteful number, since it uses less digits than its factorization.

19681371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24666 (or 24663 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 19681371 is about 4436.3691235063. The cubic root of 19681371 is about 269.9925512348.

The spelling of 19681371 in words is "nineteen million, six hundred eighty-one thousand, three hundred seventy-one".