193681 has 4 divisors (see below), whose sum is σ = 205092. Its totient is φ = 182272.

The previous prime is 193679. The next prime is 193703. The reversal of 193681 is 186391.

It is a happy number.

193681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 147456 + 46225 = 384^2 + 215^2 .

It is a cyclic number.

It is not a de Polignac number, because 193681 - 2¹ = 193679 is a prime.

It is a super-2 number, since 2×193681² = 75024659522, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (193601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5680 + ... + 5713.

It is an arithmetic number, because the mean of its divisors is an integer number (51273).

2¹⁹³⁶⁸¹ is an apocalyptic number.

It is an amenable number.

193681 is a deficient number, since it is larger than the sum of its proper divisors (11411).

193681 is a wasteful number, since it uses less digits than its factorization.

193681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11410.

The product of its digits is 1296, while the sum is 28.

The square root of 193681 is about 440.0920358289. The cubic root of 193681 is about 57.8578564446.

It can be divided in two parts, 1936 and 81, that multiplied together give a square (156816 = 396²).

The spelling of 193681 in words is "one hundred ninety-three thousand, six hundred eighty-one".