344403509 has 2 divisors, whose sum is σ = 344403510. Its totient is φ = 344403508.

The previous prime is 344403503. The next prime is 344403523. The reversal of 344403509 is 905304443.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 233417284 + 110986225 = 15278^2 + 10535^2 .

It is an emirp because it is prime and its reverse (905304443) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-344403509 is a prime.

It is a super-2 number, since 2×344403509² = 237227554023026162, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (344403503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172201754 + 172201755.

It is an arithmetic number, because the mean of its divisors is an integer number (172201755).

Almost surely, 2^344403509 is an apocalyptic number.

It is an amenable number.

344403509 is a deficient number, since it is larger than the sum of its proper divisors (1).

344403509 is an equidigital number, since it uses as much as digits as its factorization.

344403509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 344403509 is about 18558.1116765688. Note that the first 3 decimals coincide. The cubic root of 344403509 is about 700.9534687196.

The spelling of 344403509 in words is "three hundred forty-four million, four hundred three thousand, five hundred nine".