343416781 has 2 divisors, whose sum is σ = 343416782. Its totient is φ = 343416780.

The previous prime is 343416767. The next prime is 343416793. The reversal of 343416781 is 187614343.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 320087881 + 23328900 = 17891^2 + 4830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-343416781 is a prime.

It is a super-2 number, since 2×343416781² = 235870170944803922, which contains 22 as substring.

It is a Chen prime.

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 343416781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (343416581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171708390 + 171708391.

It is an arithmetic number, because the mean of its divisors is an integer number (171708391).

Almost surely, 2^343416781 is an apocalyptic number.

It is an amenable number.

343416781 is a deficient number, since it is larger than the sum of its proper divisors (1).

343416781 is an equidigital number, since it uses as much as digits as its factorization.

343416781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 37.

The square root of 343416781 is about 18531.5077907870. The cubic root of 343416781 is about 700.2834097299.

The spelling of 343416781 in words is "three hundred forty-three million, four hundred sixteen thousand, seven hundred eighty-one".