345446509 has 2 divisors, whose sum is σ = 345446510. Its totient is φ = 345446508.

The previous prime is 345446503. The next prime is 345446513. The reversal of 345446509 is 905644543.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 329422500 + 16024009 = 18150^2 + 4003^2 .

It is a cyclic number.

It is not a de Polignac number, because 345446509 - 2¹¹ = 345444461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (345446503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172723254 + 172723255.

It is an arithmetic number, because the mean of its divisors is an integer number (172723255).

Almost surely, 2^345446509 is an apocalyptic number.

It is an amenable number.

345446509 is a deficient number, since it is larger than the sum of its proper divisors (1).

345446509 is an equidigital number, since it uses as much as digits as its factorization.

345446509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 259200, while the sum is 40.

The square root of 345446509 is about 18586.1913527221. The cubic root of 345446509 is about 701.6603504891.

The spelling of 345446509 in words is "three hundred forty-five million, four hundred forty-six thousand, five hundred nine".