167861 has 2 divisors, whose sum is σ = 167862. Its totient is φ = 167860.

The previous prime is 167809. The next prime is 167863. The reversal of 167861 is 168761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164836 + 3025 = 406^2 + 55^2 .

It is an emirp because it is prime and its reverse (168761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 167861 - 2¹⁴ = 151477 is a prime.

Together with 167863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (167863) 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 as a sum of consecutive naturals, namely, 83930 + 83931.

It is an arithmetic number, because the mean of its divisors is an integer number (83931).

2¹⁶⁷⁸⁶¹ is an apocalyptic number.

It is an amenable number.

167861 is a deficient number, since it is larger than the sum of its proper divisors (1).

167861 is an equidigital number, since it uses as much as digits as its factorization.

167861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 29.

The square root of 167861 is about 409.7084329130. The cubic root of 167861 is about 55.1632614533.

Subtracting 167861 from its reverse (168761), we obtain a square (900 = 30²).

The spelling of 167861 in words is "one hundred sixty-seven thousand, eight hundred sixty-one".