191139 has 16 divisors (see below), whose sum is σ = 285600. Its totient is φ = 113568.

The previous prime is 191137. The next prime is 191141. The reversal of 191139 is 931191.

It is an interprime number because it is at equal distance from previous prime (191137) and next prime (191141).

It is not a de Polignac number, because 191139 - 2¹ = 191137 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6577 + ... + 6605.

It is an arithmetic number, because the mean of its divisors is an integer number (17850).

2¹⁹¹¹³⁹ is an apocalyptic number.

191139 is a deficient number, since it is larger than the sum of its proper divisors (94461).

191139 is an equidigital number, since it uses as much as digits as its factorization.

191139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71 (or 45 counting only the distinct ones).

The product of its digits is 243, while the sum is 24.

The square root of 191139 is about 437.1944647408. The cubic root of 191139 is about 57.6036190820.

It can be divided in two parts, 1911 and 39, that multiplied together give a square (74529 = 273²).

The spelling of 191139 in words is "one hundred ninety-one thousand, one hundred thirty-nine".