16881971 has 4 divisors (see below), whose sum is σ = 16891512. Its totient is φ = 16872432.

The previous prime is 16881961. The next prime is 16881979. The reversal of 16881971 is 17918861.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 16881971 - 2¹⁰ = 16880947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16881979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1250 + ... + 5943.

It is an arithmetic number, because the mean of its divisors is an integer number (4222878).

Almost surely, 2^16881971 is an apocalyptic number.

16881971 is a deficient number, since it is larger than the sum of its proper divisors (9541).

16881971 is an equidigital number, since it uses as much as digits as its factorization.

16881971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9540.

The product of its digits is 24192, while the sum is 41.

The square root of 16881971 is about 4108.7675767802. The cubic root of 16881971 is about 256.5317063757.

The spelling of 16881971 in words is "sixteen million, eight hundred eighty-one thousand, nine hundred seventy-one".