191338 has 16 divisors (see below), whose sum is σ = 334080. Its totient is φ = 80496.

The previous prime is 191299. The next prime is 191339. The reversal of 191338 is 833191.

It is a super-2 number, since 2×191338² = 73220460488, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (191339) 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 7 ways as a sum of consecutive naturals, for example, 1020 + ... + 1192.

It is an arithmetic number, because the mean of its divisors is an integer number (20880).

2¹⁹¹³³⁸ is an apocalyptic number.

191338 is a deficient number, since it is larger than the sum of its proper divisors (142742).

191338 is a wasteful number, since it uses less digits than its factorization.

191338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261.

The product of its digits is 648, while the sum is 25.

The square root of 191338 is about 437.4219930456. The cubic root of 191338 is about 57.6236030454.

It can be divided in two parts, 191 and 338, that added together give a square (529 = 23²).

The spelling of 191338 in words is "one hundred ninety-one thousand, three hundred thirty-eight".