16321161 has 4 divisors (see below), whose sum is σ = 21761552. Its totient is φ = 10880772.

The previous prime is 16321127. The next prime is 16321169. The reversal of 16321161 is 16112361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 16321161 - 2¹⁰ = 16320137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16321169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2720191 + ... + 2720196.

It is an arithmetic number, because the mean of its divisors is an integer number (5440388).

Almost surely, 2^16321161 is an apocalyptic number.

It is an amenable number.

16321161 is a deficient number, since it is larger than the sum of its proper divisors (5440391).

16321161 is an equidigital number, since it uses as much as digits as its factorization.

16321161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5440390.

The product of its digits is 216, while the sum is 21.

The square root of 16321161 is about 4039.9456679515. The cubic root of 16321161 is about 253.6590430067.

The spelling of 16321161 in words is "sixteen million, three hundred twenty-one thousand, one hundred sixty-one".