161873 has 2 divisors, whose sum is σ = 161874. Its totient is φ = 161872.

The previous prime is 161869. The next prime is 161879. The reversal of 161873 is 378161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107584 + 54289 = 328^2 + 233^2 .

It is a cyclic number.

It is not a de Polignac number, because 161873 - 2² = 161869 is a prime.

It is a plaindrome in base 13.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80936 + 80937.

It is an arithmetic number, because the mean of its divisors is an integer number (80937).

2¹⁶¹⁸⁷³ is an apocalyptic number.

It is an amenable number.

161873 is a deficient number, since it is larger than the sum of its proper divisors (1).

161873 is an equidigital number, since it uses as much as digits as its factorization.

161873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 26.

The square root of 161873 is about 402.3344379990. The cubic root of 161873 is about 54.4993687327.

The spelling of 161873 in words is "one hundred sixty-one thousand, eight hundred seventy-three".