16409161 has 4 divisors (see below), whose sum is σ = 16429252. Its totient is φ = 16389072.

The previous prime is 16409153. The next prime is 16409213. The reversal of 16409161 is 16190461.

16409161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16190461 = 7 ⋅2312923.

It can be written as a sum of positive squares in 2 ways, for example, as 1440000 + 14969161 = 1200^2 + 3869^2 .

It is a cyclic number.

It is not a de Polignac number, because 16409161 - 2³ = 16409153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16409461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8766 + ... + 10471.

It is an arithmetic number, because the mean of its divisors is an integer number (4107313).

Almost surely, 2^16409161 is an apocalyptic number.

It is an amenable number.

16409161 is a deficient number, since it is larger than the sum of its proper divisors (20091).

16409161 is an equidigital number, since it uses as much as digits as its factorization.

16409161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20090.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 16409161 is about 4050.8222622080. The cubic root of 16409161 is about 254.1141167838.

It can be divided in two parts, 1640 and 9161, that added together give a palindrome (10801).

The spelling of 16409161 in words is "sixteen million, four hundred nine thousand, one hundred sixty-one".