345220609 has 2 divisors, whose sum is σ = 345220610. Its totient is φ = 345220608.

The previous prime is 345220591. The next prime is 345220621. The reversal of 345220609 is 906022543.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206640625 + 138579984 = 14375^2 + 11772^2 .

It is a cyclic number.

It is not a de Polignac number, because 345220609 - 2¹⁹ = 344696321 is a prime.

It is equal to p_18560533 and since 345220609 and 18560533 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (345220699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172610304 + 172610305.

It is an arithmetic number, because the mean of its divisors is an integer number (172610305).

Almost surely, 2^345220609 is an apocalyptic number.

It is an amenable number.

345220609 is a deficient number, since it is larger than the sum of its proper divisors (1).

345220609 is an equidigital number, since it uses as much as digits as its factorization.

345220609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 345220609 is about 18580.1132666085. The cubic root of 345220609 is about 701.5073700880.

The spelling of 345220609 in words is "three hundred forty-five million, two hundred twenty thousand, six hundred nine".