864161 has 4 divisors (see below), whose sum is σ = 915012. Its totient is φ = 813312.

The previous prime is 864151. The next prime is 864167. The reversal of 864161 is 161468.

864161 = T₁₅₈ + T₁₅₉ + ... + T₂₀₈.

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 555025 + 309136 = 745^2 + 556^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-864161 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 864161.

It is not an unprimeable number, because it can be changed into a prime (864167) 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, 25400 + ... + 25433.

It is an arithmetic number, because the mean of its divisors is an integer number (228753).

2⁸⁶⁴¹⁶¹ is an apocalyptic number.

It is an amenable number.

864161 is a deficient number, since it is larger than the sum of its proper divisors (50851).

864161 is a wasteful number, since it uses less digits than its factorization.

864161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50850.

The product of its digits is 1152, while the sum is 26.

The square root of 864161 is about 929.6026032666. The cubic root of 864161 is about 95.2499787592.

The spelling of 864161 in words is "eight hundred sixty-four thousand, one hundred sixty-one".