16865161 has 4 divisors (see below), whose sum is σ = 16978500. Its totient is φ = 16751824.

The previous prime is 16865129. The next prime is 16865171. The reversal of 16865161 is 16156861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4227136 + 12638025 = 2056^2 + 3555^2 .

It is a cyclic number.

It is not a de Polignac number, because 16865161 - 2⁵ = 16865129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16865171) 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, 56446 + ... + 56743.

It is an arithmetic number, because the mean of its divisors is an integer number (4244625).

Almost surely, 2^16865161 is an apocalyptic number.

It is an amenable number.

16865161 is a deficient number, since it is larger than the sum of its proper divisors (113339).

16865161 is a wasteful number, since it uses less digits than its factorization.

16865161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113338.

The product of its digits is 8640, while the sum is 34.

The square root of 16865161 is about 4106.7214417343. The cubic root of 16865161 is about 256.4465320778.

The spelling of 16865161 in words is "sixteen million, eight hundred sixty-five thousand, one hundred sixty-one".