343643561 has 4 divisors (see below), whose sum is σ = 349277124. Its totient is φ = 338010000.

The previous prime is 343643543. The next prime is 343643569. The reversal of 343643561 is 165346343.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 117592336 + 226051225 = 10844^2 + 15035^2 .

It is a cyclic number.

It is not a de Polignac number, because 343643561 - 2¹⁸ = 343381417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (343643569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2816690 + ... + 2816811.

It is an arithmetic number, because the mean of its divisors is an integer number (87319281).

Almost surely, 2^343643561 is an apocalyptic number.

It is an amenable number.

343643561 is a deficient number, since it is larger than the sum of its proper divisors (5633563).

343643561 is an equidigital number, since it uses as much as digits as its factorization.

343643561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5633562.

The product of its digits is 77760, while the sum is 35.

The square root of 343643561 is about 18537.6255491365. The cubic root of 343643561 is about 700.4375230753.

The spelling of 343643561 in words is "three hundred forty-three million, six hundred forty-three thousand, five hundred sixty-one".