347981 has 2 divisors, whose sum is σ = 347982. Its totient is φ = 347980.

The previous prime is 347969. The next prime is 347983. The reversal of 347981 is 189743.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 280900 + 67081 = 530^2 + 259^2 .

It is an emirp because it is prime and its reverse (189743) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 347981 - 2¹⁸ = 85837 is a prime.

It is a super-2 number, since 2×347981² = 242181552722, which contains 22 as substring.

Together with 347983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 347981.

It is not a weakly prime, because it can be changed into another prime (347983) 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 as a sum of consecutive naturals, namely, 173990 + 173991.

It is an arithmetic number, because the mean of its divisors is an integer number (173991).

2³⁴⁷⁹⁸¹ is an apocalyptic number.

It is an amenable number.

347981 is a deficient number, since it is larger than the sum of its proper divisors (1).

347981 is an equidigital number, since it uses as much as digits as its factorization.

347981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 32.

The square root of 347981 is about 589.8991439221. The cubic root of 347981 is about 70.3372164299.

The spelling of 347981 in words is "three hundred forty-seven thousand, nine hundred eighty-one".