193391 has 4 divisors (see below), whose sum is σ = 210984. Its totient is φ = 175800.

The previous prime is 193387. The next prime is 193393.

193391 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 193391 - 2² = 193387 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 193391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (193393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8780 + ... + 8801.

It is an arithmetic number, because the mean of its divisors is an integer number (52746).

2¹⁹³³⁹¹ is an apocalyptic number.

193391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

193391 is a deficient number, since it is larger than the sum of its proper divisors (17593).

193391 is a wasteful number, since it uses less digits than its factorization.

193391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17592.

The product of its digits is 729, while the sum is 26.

The square root of 193391 is about 439.7624358674. The cubic root of 193391 is about 57.8289650206.

The spelling of 193391 in words is "one hundred ninety-three thousand, three hundred ninety-one".