16530401 has 2 divisors, whose sum is σ = 16530402. Its totient is φ = 16530400.

The previous prime is 16530389. The next prime is 16530413. The reversal of 16530401 is 10403561.

It is a balanced prime because it is at equal distance from previous prime (16530389) and next prime (16530413).

It can be written as a sum of positive squares in only one way, i.e., 8549776 + 7980625 = 2924^2 + 2825^2 .

It is a cyclic number.

It is not a de Polignac number, because 16530401 - 2⁶ = 16530337 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (16530301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8265200 + 8265201.

It is an arithmetic number, because the mean of its divisors is an integer number (8265201).

Almost surely, 2^16530401 is an apocalyptic number.

It is an amenable number.

16530401 is a deficient number, since it is larger than the sum of its proper divisors (1).

16530401 is an equidigital number, since it uses as much as digits as its factorization.

16530401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 16530401 is about 4065.7595846287. The cubic root of 16530401 is about 254.7384271502.

Adding to 16530401 its reverse (10403561), we get a palindrome (26933962).

The spelling of 16530401 in words is "sixteen million, five hundred thirty thousand, four hundred one".