259309409 has 2 divisors, whose sum is σ = 259309410. Its totient is φ = 259309408.

The previous prime is 259309399. The next prime is 259309423. The reversal of 259309409 is 904903952.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 222099409 + 37210000 = 14903^2 + 6100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-259309409 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (259309439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129654704 + 129654705.

It is an arithmetic number, because the mean of its divisors is an integer number (129654705).

Almost surely, 2^259309409 is an apocalyptic number.

It is an amenable number.

259309409 is a deficient number, since it is larger than the sum of its proper divisors (1).

259309409 is an equidigital number, since it uses as much as digits as its factorization.

259309409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 87480, while the sum is 41.

The square root of 259309409 is about 16103.0869400870. The cubic root of 259309409 is about 637.6848390842.

The spelling of 259309409 in words is "two hundred fifty-nine million, three hundred nine thousand, four hundred nine".