343256981 has 4 divisors (see below), whose sum is σ = 343404972. Its totient is φ = 343108992.

The previous prime is 343256959. The next prime is 343256993. The reversal of 343256981 is 189652343.

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 40844881 + 302412100 = 6391^2 + 17390^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-343256981 is a prime.

It is a super-3 number, since 3×343256981³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (343256941) 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 in 3 ways as a sum of consecutive naturals, for example, 70460 + ... + 75173.

It is an arithmetic number, because the mean of its divisors is an integer number (85851243).

Almost surely, 2^343256981 is an apocalyptic number.

It is an amenable number.

343256981 is a deficient number, since it is larger than the sum of its proper divisors (147991).

343256981 is a wasteful number, since it uses less digits than its factorization.

343256981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147990.

The product of its digits is 155520, while the sum is 41.

The square root of 343256981 is about 18527.1957133291. The cubic root of 343256981 is about 700.1747733664.

The spelling of 343256981 in words is "three hundred forty-three million, two hundred fifty-six thousand, nine hundred eighty-one".