16989671 has 2 divisors, whose sum is σ = 16989672. Its totient is φ = 16989670.

The previous prime is 16989631. The next prime is 16989677. The reversal of 16989671 is 17698961.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16989671 - 2¹⁸ = 16727527 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16989677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8494835 + 8494836.

It is an arithmetic number, because the mean of its divisors is an integer number (8494836).

Almost surely, 2^16989671 is an apocalyptic number.

16989671 is a deficient number, since it is larger than the sum of its proper divisors (1).

16989671 is an equidigital number, since it uses as much as digits as its factorization.

16989671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 47.

The square root of 16989671 is about 4121.8528600618. The cubic root of 16989671 is about 257.0760725005.

The spelling of 16989671 in words is "sixteen million, nine hundred eighty-nine thousand, six hundred seventy-one".