343581643 has 2 divisors, whose sum is σ = 343581644. Its totient is φ = 343581642.

The previous prime is 343581631. The next prime is 343581671. The reversal of 343581643 is 346185343.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-343581643 is a prime.

It is not a weakly prime, because it can be changed into another prime (343581673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171790821 + 171790822.

It is an arithmetic number, because the mean of its divisors is an integer number (171790822).

Almost surely, 2^343581643 is an apocalyptic number.

343581643 is a deficient number, since it is larger than the sum of its proper divisors (1).

343581643 is an equidigital number, since it uses as much as digits as its factorization.

343581643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 37.

The square root of 343581643 is about 18535.9554110383. The cubic root of 343581643 is about 700.3954520648.

It can be divided in two parts, 3435 and 81643, that added together give a triangular number (85078 = T₄₁₂).

The spelling of 343581643 in words is "three hundred forty-three million, five hundred eighty-one thousand, six hundred forty-three".