259660109 has 2 divisors, whose sum is σ = 259660110. Its totient is φ = 259660108.

The previous prime is 259660069. The next prime is 259660129. The reversal of 259660109 is 901066952.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180983209 + 78676900 = 13453^2 + 8870^2 .

It is a cyclic number.

It is not a de Polignac number, because 259660109 - 2¹² = 259656013 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (259660129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129830054 + 129830055.

It is an arithmetic number, because the mean of its divisors is an integer number (129830055).

Almost surely, 2^259660109 is an apocalyptic number.

It is an amenable number.

259660109 is a deficient number, since it is larger than the sum of its proper divisors (1).

259660109 is an equidigital number, since it uses as much as digits as its factorization.

259660109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 259660109 is about 16113.9724773254. The cubic root of 259660109 is about 637.9721860694.

The spelling of 259660109 in words is "two hundred fifty-nine million, six hundred sixty thousand, one hundred nine".