16140521 has 2 divisors, whose sum is σ = 16140522. Its totient is φ = 16140520.

The previous prime is 16140479. The next prime is 16140529. The reversal of 16140521 is 12504161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11999296 + 4141225 = 3464^2 + 2035^2 .

It is an emirp because it is prime and its reverse (12504161) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16140521 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 16140493 and 16140502.

It is not a weakly prime, because it can be changed into another prime (16140529) 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, 8070260 + 8070261.

It is an arithmetic number, because the mean of its divisors is an integer number (8070261).

Almost surely, 2^16140521 is an apocalyptic number.

It is an amenable number.

16140521 is a deficient number, since it is larger than the sum of its proper divisors (1).

16140521 is an equidigital number, since it uses as much as digits as its factorization.

16140521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 16140521 is about 4017.5267267313. The cubic root of 16140521 is about 252.7197498792.

Adding to 16140521 its reverse (12504161), we get a palindrome (28644682).

It can be divided in two parts, 16140 and 521, that added together give a palindrome (16661).

The spelling of 16140521 in words is "sixteen million, one hundred forty thousand, five hundred twenty-one".