260235509 has 2 divisors, whose sum is σ = 260235510. Its totient is φ = 260235508.

The previous prime is 260235499. The next prime is 260235511. The reversal of 260235509 is 905532062.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138133009 + 122102500 = 11753^2 + 11050^2 .

It is a cyclic number.

It is not a de Polignac number, because 260235509 - 2²⁰ = 259186933 is a prime.

Together with 260235511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (260235539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130117754 + 130117755.

It is an arithmetic number, because the mean of its divisors is an integer number (130117755).

Almost surely, 2^260235509 is an apocalyptic number.

It is an amenable number.

260235509 is a deficient number, since it is larger than the sum of its proper divisors (1).

260235509 is an equidigital number, since it uses as much as digits as its factorization.

260235509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 260235509 is about 16131.8166676912. The cubic root of 260235509 is about 638.4430816275.

The spelling of 260235509 in words is "two hundred sixty million, two hundred thirty-five thousand, five hundred nine".