345603809 has 2 divisors, whose sum is σ = 345603810. Its totient is φ = 345603808.

The previous prime is 345603803. The next prime is 345603871. The reversal of 345603809 is 908306543.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 341214784 + 4389025 = 18472^2 + 2095^2 .

It is a cyclic number.

It is not a de Polignac number, because 345603809 - 2⁸ = 345603553 is a prime.

It is not a weakly prime, because it can be changed into another prime (345603803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172801904 + 172801905.

It is an arithmetic number, because the mean of its divisors is an integer number (172801905).

Almost surely, 2^345603809 is an apocalyptic number.

It is an amenable number.

345603809 is a deficient number, since it is larger than the sum of its proper divisors (1).

345603809 is an equidigital number, since it uses as much as digits as its factorization.

345603809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 345603809 is about 18590.4225073020. The cubic root of 345603809 is about 701.7668353060.

The spelling of 345603809 in words is "three hundred forty-five million, six hundred three thousand, eight hundred nine".