16161281 has 4 divisors (see below), whose sum is σ = 16218672. Its totient is φ = 16103892.

The previous prime is 16161269. The next prime is 16161283. The reversal of 16161281 is 18216161.

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 a cyclic number.

It is not a de Polignac number, because 16161281 - 2¹⁰ = 16160257 is a prime.

It is a super-2 number, since 2×16161281² = 522374007121922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16161281.

It is not an unprimeable number, because it can be changed into a prime (16161283) 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, 28271 + ... + 28836.

It is an arithmetic number, because the mean of its divisors is an integer number (4054668).

Almost surely, 2^16161281 is an apocalyptic number.

It is an amenable number.

16161281 is a deficient number, since it is larger than the sum of its proper divisors (57391).

16161281 is an equidigital number, since it uses as much as digits as its factorization.

16161281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57390.

The product of its digits is 576, while the sum is 26.

The square root of 16161281 is about 4020.1095756210. The cubic root of 16161281 is about 252.8280531629.

The spelling of 16161281 in words is "sixteen million, one hundred sixty-one thousand, two hundred eighty-one".