16614821 has 2 divisors, whose sum is σ = 16614822. Its totient is φ = 16614820.

The previous prime is 16614817. The next prime is 16614859. The reversal of 16614821 is 12841661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14737921 + 1876900 = 3839^2 + 1370^2 .

It is a cyclic number.

It is not a de Polignac number, because 16614821 - 2² = 16614817 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16614121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8307410 + 8307411.

It is an arithmetic number, because the mean of its divisors is an integer number (8307411).

Almost surely, 2^16614821 is an apocalyptic number.

It is an amenable number.

16614821 is a deficient number, since it is larger than the sum of its proper divisors (1).

16614821 is an equidigital number, since it uses as much as digits as its factorization.

16614821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 29.

The square root of 16614821 is about 4076.1281873857. The cubic root of 16614821 is about 255.1713368570.

The spelling of 16614821 in words is "sixteen million, six hundred fourteen thousand, eight hundred twenty-one".