339991 has 2 divisors, whose sum is σ = 339992. Its totient is φ = 339990.

The previous prime is 339959. The next prime is 340007. The reversal of 339991 is 199933.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (199933) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 339991 - 2⁵ = 339959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (339091) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 169995 + 169996.

It is an arithmetic number, because the mean of its divisors is an integer number (169996).

2³³⁹⁹⁹¹ is an apocalyptic number.

339991 is a deficient number, since it is larger than the sum of its proper divisors (1).

339991 is an equidigital number, since it uses as much as digits as its factorization.

339991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6561, while the sum is 34.

The square root of 339991 is about 583.0874719971. The cubic root of 339991 is about 69.7947046226.

The spelling of 339991 in words is "three hundred thirty-nine thousand, nine hundred ninety-one".