343809561 has 8 divisors (see below), whose sum is σ = 473200384. Its totient is φ = 221812560.

The previous prime is 343809551. The next prime is 343809601. The reversal of 343809561 is 165908343.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 343809561 - 2¹⁵ = 343776793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (343809551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1848346 + ... + 1848531.

It is an arithmetic number, because the mean of its divisors is an integer number (59150048).

Almost surely, 2^343809561 is an apocalyptic number.

343809561 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

343809561 is a deficient number, since it is larger than the sum of its proper divisors (129390823).

343809561 is a wasteful number, since it uses less digits than its factorization.

343809561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3696911.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 343809561 is about 18542.1023888878. The cubic root of 343809561 is about 700.5502890581.

The spelling of 343809561 in words is "three hundred forty-three million, eight hundred nine thousand, five hundred sixty-one".