16488721 has 2 divisors, whose sum is σ = 16488722. Its totient is φ = 16488720.

The previous prime is 16488709. The next prime is 16488743. The reversal of 16488721 is 12788461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12327121 + 4161600 = 3511^2 + 2040^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16488721 is a prime.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (16488701) 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, 8244360 + 8244361.

It is an arithmetic number, because the mean of its divisors is an integer number (8244361).

Almost surely, 2^16488721 is an apocalyptic number.

It is an amenable number.

16488721 is a deficient number, since it is larger than the sum of its proper divisors (1).

16488721 is an equidigital number, since it uses as much as digits as its factorization.

16488721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21504, while the sum is 37.

The square root of 16488721 is about 4060.6306160497. The cubic root of 16488721 is about 254.5241465273.

The spelling of 16488721 in words is "sixteen million, four hundred eighty-eight thousand, seven hundred twenty-one".