191039 has 2 divisors, whose sum is σ = 191040. Its totient is φ = 191038.

The previous prime is 191033. The next prime is 191047. The reversal of 191039 is 930191.

It is a weak prime.

It is an emirp because it is prime and its reverse (930191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 191039 - 2⁸ = 190783 is a prime.

It is a Chen prime.

It is equal to p₁₇₂₄₉ and since 191039 and 17249 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95519 + 95520.

It is an arithmetic number, because the mean of its divisors is an integer number (95520).

2¹⁹¹⁰³⁹ is an apocalyptic number.

191039 is a deficient number, since it is larger than the sum of its proper divisors (1).

191039 is an equidigital number, since it uses as much as digits as its factorization.

191039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 243, while the sum is 23.

The square root of 191039 is about 437.0800841951. The cubic root of 191039 is about 57.5935716527.

The spelling of 191039 in words is "one hundred ninety-one thousand, thirty-nine".