16350721 has 2 divisors, whose sum is σ = 16350722. Its totient is φ = 16350720.

The previous prime is 16350713. The next prime is 16350731. The reversal of 16350721 is 12705361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13249600 + 3101121 = 3640^2 + 1761^2 .

It is a cyclic number.

It is not a de Polignac number, because 16350721 - 2³ = 16350713 is a prime.

It is not a weakly prime, because it can be changed into another prime (16350701) 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, 8175360 + 8175361.

It is an arithmetic number, because the mean of its divisors is an integer number (8175361).

Almost surely, 2^16350721 is an apocalyptic number.

It is an amenable number.

16350721 is a deficient number, since it is larger than the sum of its proper divisors (1).

16350721 is an equidigital number, since it uses as much as digits as its factorization.

16350721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 16350721 is about 4043.6024779892. The cubic root of 16350721 is about 253.8120884734.

It can be divided in two parts, 16350 and 721, that added together give a palindrome (17071).

The spelling of 16350721 in words is "sixteen million, three hundred fifty thousand, seven hundred twenty-one".