340561709 has 2 divisors, whose sum is σ = 340561710. Its totient is φ = 340561708.

The previous prime is 340561651. The next prime is 340561723. The reversal of 340561709 is 907165043.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 339664900 + 896809 = 18430^2 + 947^2 .

It is an emirp because it is prime and its reverse (907165043) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-340561709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (340561789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170280854 + 170280855.

It is an arithmetic number, because the mean of its divisors is an integer number (170280855).

Almost surely, 2^340561709 is an apocalyptic number.

It is an amenable number.

340561709 is a deficient number, since it is larger than the sum of its proper divisors (1).

340561709 is an equidigital number, since it uses as much as digits as its factorization.

340561709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 340561709 is about 18454.3141026699. The cubic root of 340561709 is about 698.3373526286.

The spelling of 340561709 in words is "three hundred forty million, five hundred sixty-one thousand, seven hundred nine".