64161 has 6 divisors (see below), whose sum is σ = 92690. Its totient is φ = 42768.

The previous prime is 64157. The next prime is 64171. The reversal of 64161 is 16146.

64161 = T₅₅ + T₅₆ + ... + T₈₁.

It can be written as a sum of positive squares in only one way, i.e., 57600 + 6561 = 240^2 + 81^2 .

It is not a de Polignac number, because 64161 - 2² = 64157 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (64151) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3556 + ... + 3573.

2⁶⁴¹⁶¹ is an apocalyptic number.

It is an amenable number.

64161 is a deficient number, since it is larger than the sum of its proper divisors (28529).

64161 is a wasteful number, since it uses less digits than its factorization.

64161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7135 (or 7132 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 64161 is about 253.3002171337. The cubic root of 64161 is about 40.0335135798.

It can be divided in two parts, 64 and 161, that added together give a square (225 = 15²).

The spelling of 64161 in words is "sixty-four thousand, one hundred sixty-one".