16321541 has 2 divisors, whose sum is σ = 16321542. Its totient is φ = 16321540.

The previous prime is 16321537. The next prime is 16321561. The reversal of 16321541 is 14512361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10176100 + 6145441 = 3190^2 + 2479^2 .

It is an emirp because it is prime and its reverse (14512361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16321541 - 2² = 16321537 is a prime.

It is a super-2 number, since 2×16321541² = 532785401229362, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16321561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8160770 + 8160771.

It is an arithmetic number, because the mean of its divisors is an integer number (8160771).

Almost surely, 2^16321541 is an apocalyptic number.

It is an amenable number.

16321541 is a deficient number, since it is larger than the sum of its proper divisors (1).

16321541 is an equidigital number, since it uses as much as digits as its factorization.

16321541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 23.

The square root of 16321541 is about 4039.9926980132. The cubic root of 16321541 is about 253.6610116103.

The spelling of 16321541 in words is "sixteen million, three hundred twenty-one thousand, five hundred forty-one".