193881 has 4 divisors (see below), whose sum is σ = 258512. Its totient is φ = 129252.

The previous prime is 193877. The next prime is 193883. The reversal of 193881 is 188391.

193881 is nontrivially palindromic in base 12.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 193881 - 2² = 193877 is a prime.

It is a super-2 number, since 2×193881² = 75179684322, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 193881.

It is not an unprimeable number, because it can be changed into a prime (193883) 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, 32311 + ... + 32316.

It is an arithmetic number, because the mean of its divisors is an integer number (64628).

2¹⁹³⁸⁸¹ is an apocalyptic number.

It is an amenable number.

193881 is a deficient number, since it is larger than the sum of its proper divisors (64631).

193881 is an equidigital number, since it uses as much as digits as its factorization.

193881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64630.

The product of its digits is 1728, while the sum is 30.

The square root of 193881 is about 440.3192023975. The cubic root of 193881 is about 57.8777647655.

The spelling of 193881 in words is "one hundred ninety-three thousand, eight hundred eighty-one".