16752721 has 2 divisors, whose sum is σ = 16752722. Its totient is φ = 16752720.

The previous prime is 16752713. The next prime is 16752731. The reversal of 16752721 is 12725761.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12173121 + 4579600 = 3489^2 + 2140^2 .

It is a cyclic number.

It is not a de Polignac number, because 16752721 - 2³ = 16752713 is a prime.

It is not a weakly prime, because it can be changed into another prime (16752731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8376360 + 8376361.

It is an arithmetic number, because the mean of its divisors is an integer number (8376361).

Almost surely, 2^16752721 is an apocalyptic number.

It is an amenable number.

16752721 is a deficient number, since it is larger than the sum of its proper divisors (1).

16752721 is an equidigital number, since it uses as much as digits as its factorization.

16752721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5880, while the sum is 31.

The square root of 16752721 is about 4093.0087954951. The cubic root of 16752721 is about 255.8753513046.

The spelling of 16752721 in words is "sixteen million, seven hundred fifty-two thousand, seven hundred twenty-one".