16873721 has 2 divisors, whose sum is σ = 16873722. Its totient is φ = 16873720.

The previous prime is 16873711. The next prime is 16873723. The reversal of 16873721 is 12737861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14167696 + 2706025 = 3764^2 + 1645^2 .

It is a cyclic number.

It is not a de Polignac number, because 16873721 - 2⁶ = 16873657 is a prime.

Together with 16873723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16873723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8436860 + 8436861.

It is an arithmetic number, because the mean of its divisors is an integer number (8436861).

Almost surely, 2^16873721 is an apocalyptic number.

It is an amenable number.

16873721 is a deficient number, since it is larger than the sum of its proper divisors (1).

16873721 is an equidigital number, since it uses as much as digits as its factorization.

16873721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 35.

The square root of 16873721 is about 4107.7635034164. The cubic root of 16873721 is about 256.4899116623.

The spelling of 16873721 in words is "sixteen million, eight hundred seventy-three thousand, seven hundred twenty-one".