16980989 has 2 divisors, whose sum is σ = 16980990. Its totient is φ = 16980988.

The previous prime is 16980983. The next prime is 16980991. The reversal of 16980989 is 98908961.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16687225 + 293764 = 4085^2 + 542^2 .

It is a cyclic number.

It is not a de Polignac number, because 16980989 - 2¹² = 16976893 is a prime.

Together with 16980991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16980983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8490494 + 8490495.

It is an arithmetic number, because the mean of its divisors is an integer number (8490495).

Almost surely, 2^16980989 is an apocalyptic number.

It is an amenable number.

16980989 is a deficient number, since it is larger than the sum of its proper divisors (1).

16980989 is an equidigital number, since it uses as much as digits as its factorization.

16980989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 50.

The square root of 16980989 is about 4120.7995583382. The cubic root of 16980989 is about 257.0322750122.

The spelling of 16980989 in words is "sixteen million, nine hundred eighty thousand, nine hundred eighty-nine".