343781261 has 2 divisors, whose sum is σ = 343781262. Its totient is φ = 343781260.

The previous prime is 343781257. The next prime is 343781287. The reversal of 343781261 is 162187343.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 324684361 + 19096900 = 18019^2 + 4370^2 .

It is a cyclic number.

It is not a de Polignac number, because 343781261 - 2² = 343781257 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (343781461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171890630 + 171890631.

It is an arithmetic number, because the mean of its divisors is an integer number (171890631).

Almost surely, 2^343781261 is an apocalyptic number.

It is an amenable number.

343781261 is a deficient number, since it is larger than the sum of its proper divisors (1).

343781261 is an equidigital number, since it uses as much as digits as its factorization.

343781261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 35.

The square root of 343781261 is about 18541.3392450492. The cubic root of 343781261 is about 700.5310670630.

The spelling of 343781261 in words is "three hundred forty-three million, seven hundred eighty-one thousand, two hundred sixty-one".