349831 has 2 divisors, whose sum is σ = 349832. Its totient is φ = 349830.

The previous prime is 349829. The next prime is 349837. The reversal of 349831 is 138943.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 349831 - 2¹ = 349829 is a prime.

It is a super-2 number, since 2×349831² = 244763457122, which contains 22 as substring.

Together with 349829, it forms a pair of twin primes.

349831 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 349831.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (349837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 174915 + 174916.

It is an arithmetic number, because the mean of its divisors is an integer number (174916).

2³⁴⁹⁸³¹ is an apocalyptic number.

349831 is a deficient number, since it is larger than the sum of its proper divisors (1).

349831 is an equidigital number, since it uses as much as digits as its factorization.

349831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 28.

The square root of 349831 is about 591.4651299950. The cubic root of 349831 is about 70.4616426994.

The spelling of 349831 in words is "three hundred forty-nine thousand, eight hundred thirty-one".