343470781 has 2 divisors, whose sum is σ = 343470782. Its totient is φ = 343470780.

The previous prime is 343470739. The next prime is 343470797. The reversal of 343470781 is 187074343.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 335439225 + 8031556 = 18315^2 + 2834^2 .

It is an emirp because it is prime and its reverse (187074343) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 343470781 - 2⁹ = 343470269 is a prime.

It is a super-2 number, since 2×343470781² = 235944354801499922, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 343470781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (343470481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171735390 + 171735391.

It is an arithmetic number, because the mean of its divisors is an integer number (171735391).

Almost surely, 2^343470781 is an apocalyptic number.

It is an amenable number.

343470781 is a deficient number, since it is larger than the sum of its proper divisors (1).

343470781 is an equidigital number, since it uses as much as digits as its factorization.

343470781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 343470781 is about 18532.9647115619. The cubic root of 343470781 is about 700.3201127725.

The spelling of 343470781 in words is "three hundred forty-three million, four hundred seventy thousand, seven hundred eighty-one".