16577321 has 2 divisors, whose sum is σ = 16577322. Its totient is φ = 16577320.

The previous prime is 16577303. The next prime is 16577339. The reversal of 16577321 is 12377561.

It is a balanced prime because it is at equal distance from previous prime (16577303) and next prime (16577339).

It can be written as a sum of positive squares in only one way, i.e., 16362025 + 215296 = 4045^2 + 464^2 .

It is a cyclic number.

It is not a de Polignac number, because 16577321 - 2⁶ = 16577257 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (16577021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8288660 + 8288661.

It is an arithmetic number, because the mean of its divisors is an integer number (8288661).

Almost surely, 2^16577321 is an apocalyptic number.

It is an amenable number.

16577321 is a deficient number, since it is larger than the sum of its proper divisors (1).

16577321 is an equidigital number, since it uses as much as digits as its factorization.

16577321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8820, while the sum is 32.

The square root of 16577321 is about 4071.5256354345. The cubic root of 16577321 is about 254.9792165555.

The spelling of 16577321 in words is "sixteen million, five hundred seventy-seven thousand, three hundred twenty-one".