343891609 has 2 divisors, whose sum is σ = 343891610. Its totient is φ = 343891608.

The previous prime is 343891591. The next prime is 343891619. The reversal of 343891609 is 906198343.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 331968400 + 11923209 = 18220^2 + 3453^2 .

It is a cyclic number.

It is not a de Polignac number, because 343891609 - 2²⁵ = 310337177 is a prime.

It is a super-2 number, since 2×343891609² = 236522877481217762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (343891619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171945804 + 171945805.

It is an arithmetic number, because the mean of its divisors is an integer number (171945805).

Almost surely, 2^343891609 is an apocalyptic number.

It is an amenable number.

343891609 is a deficient number, since it is larger than the sum of its proper divisors (1).

343891609 is an equidigital number, since it uses as much as digits as its factorization.

343891609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 343891609 is about 18544.3147352497. The cubic root of 343891609 is about 700.6060119398.

The spelling of 343891609 in words is "three hundred forty-three million, eight hundred ninety-one thousand, six hundred nine".