345005909 has 2 divisors, whose sum is σ = 345005910. Its totient is φ = 345005908.

The previous prime is 345005893. The next prime is 345005917. The reversal of 345005909 is 909500543.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 344213809 + 792100 = 18553^2 + 890^2 .

It is a cyclic number.

It is not a de Polignac number, because 345005909 - 2⁴ = 345005893 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (345005929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172502954 + 172502955.

It is an arithmetic number, because the mean of its divisors is an integer number (172502955).

Almost surely, 2^345005909 is an apocalyptic number.

It is an amenable number.

345005909 is a deficient number, since it is larger than the sum of its proper divisors (1).

345005909 is an equidigital number, since it uses as much as digits as its factorization.

345005909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24300, while the sum is 35.

The square root of 345005909 is about 18574.3346852586. The cubic root of 345005909 is about 701.3619125048.

The spelling of 345005909 in words is "three hundred forty-five million, five thousand, nine hundred nine".