16503541 has 2 divisors, whose sum is σ = 16503542. Its totient is φ = 16503540.

The previous prime is 16503503. The next prime is 16503547. The reversal of 16503541 is 14530561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16443025 + 60516 = 4055^2 + 246^2 .

It is a cyclic number.

It is not a de Polignac number, because 16503541 - 2¹⁷ = 16372469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16503547) 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, 8251770 + 8251771.

It is an arithmetic number, because the mean of its divisors is an integer number (8251771).

Almost surely, 2^16503541 is an apocalyptic number.

It is an amenable number.

16503541 is a deficient number, since it is larger than the sum of its proper divisors (1).

16503541 is an equidigital number, since it uses as much as digits as its factorization.

16503541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 16503541 is about 4062.4550459051. The cubic root of 16503541 is about 254.6003788058.

The spelling of 16503541 in words is "sixteen million, five hundred three thousand, five hundred forty-one".