345299509 has 2 divisors, whose sum is σ = 345299510. Its totient is φ = 345299508.

The previous prime is 345299501. The next prime is 345299527. The reversal of 345299509 is 905992543.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 343064484 + 2235025 = 18522^2 + 1495^2 .

It is a cyclic number.

It is not a de Polignac number, because 345299509 - 2³ = 345299501 is a prime.

It is a Chen prime.

It is equal to p_18564499 and since 345299509 and 18564499 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (345299501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172649754 + 172649755.

It is an arithmetic number, because the mean of its divisors is an integer number (172649755).

Almost surely, 2^345299509 is an apocalyptic number.

It is an amenable number.

345299509 is a deficient number, since it is larger than the sum of its proper divisors (1).

345299509 is an equidigital number, since it uses as much as digits as its factorization.

345299509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 437400, while the sum is 46.

The square root of 345299509 is about 18582.2363831698. The cubic root of 345299509 is about 701.5608090716.

The spelling of 345299509 in words is "three hundred forty-five million, two hundred ninety-nine thousand, five hundred nine".