16211641 has 2 divisors, whose sum is σ = 16211642. Its totient is φ = 16211640.

The previous prime is 16211639. The next prime is 16211651. The reversal of 16211641 is 14611261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12752041 + 3459600 = 3571^2 + 1860^2 .

It is a cyclic number.

It is not a de Polignac number, because 16211641 - 2¹ = 16211639 is a prime.

Together with 16211639, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (16211651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8105820 + 8105821.

It is an arithmetic number, because the mean of its divisors is an integer number (8105821).

Almost surely, 2^16211641 is an apocalyptic number.

It is an amenable number.

16211641 is a deficient number, since it is larger than the sum of its proper divisors (1).

16211641 is an equidigital number, since it uses as much as digits as its factorization.

16211641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 22.

The square root of 16211641 is about 4026.3682146570. The cubic root of 16211641 is about 253.0903924845.

The spelling of 16211641 in words is "sixteen million, two hundred eleven thousand, six hundred forty-one".