19971116 has 12 divisors (see below), whose sum is σ = 38126760. Its totient is φ = 9077760.

The previous prime is 19971101. The next prime is 19971163. The reversal of 19971116 is 61117991.

It is an unprimeable number.

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, 226901 + ... + 226988.

It is an arithmetic number, because the mean of its divisors is an integer number (3177230).

Almost surely, 2^19971116 is an apocalyptic number.

It is an amenable number.

19971116 is a deficient number, since it is larger than the sum of its proper divisors (18155644).

19971116 is a wasteful number, since it uses less digits than its factorization.

19971116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453904 (or 453902 counting only the distinct ones).

The product of its digits is 3402, while the sum is 35.

The square root of 19971116 is about 4468.9054588344. The cubic root of 19971116 is about 271.3110266394.

It can be divided in two parts, 1997 and 1116, that added together give a palindrome (3113).

The spelling of 19971116 in words is "nineteen million, nine hundred seventy-one thousand, one hundred sixteen".