345605009 has 2 divisors, whose sum is σ = 345605010. Its totient is φ = 345605008.

The previous prime is 345604999. The next prime is 345605011. The reversal of 345605009 is 900506543.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 295152400 + 50452609 = 17180^2 + 7103^2 .

It is a cyclic number.

It is not a de Polignac number, because 345605009 - 2¹⁶ = 345539473 is a prime.

Together with 345605011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (345605069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172802504 + 172802505.

It is an arithmetic number, because the mean of its divisors is an integer number (172802505).

Almost surely, 2^345605009 is an apocalyptic number.

It is an amenable number.

345605009 is a deficient number, since it is larger than the sum of its proper divisors (1).

345605009 is an equidigital number, since it uses as much as digits as its factorization.

345605009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 345605009 is about 18590.4547819573. The cubic root of 345605009 is about 701.7676475262.

The spelling of 345605009 in words is "three hundred forty-five million, six hundred five thousand, nine".