67161 has 8 divisors (see below), whose sum is σ = 91264. Its totient is φ = 43920.

The previous prime is 67157. The next prime is 67169. The reversal of 67161 is 16176.

67161 = T₁₃ + T₁₄ + ... + T₇₃.

67161 is a nontrivial binomial coefficient, being equal to C(367, 2).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 67161 - 2² = 67157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1 + ... + 366.

It is an arithmetic number, because the mean of its divisors is an integer number (11408).

2⁶⁷¹⁶¹ is an apocalyptic number.

67161 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

67161 is the 366-th triangular number.

It is an amenable number.

67161 is a deficient number, since it is larger than the sum of its proper divisors (24103).

67161 is a wasteful number, since it uses less digits than its factorization.

67161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431.

The product of its digits is 252, while the sum is 21.

The square root of 67161 is about 259.1543941360. The cubic root of 67161 is about 40.6479877788.

The spelling of 67161 in words is "sixty-seven thousand, one hundred sixty-one".