263342509 has 2 divisors, whose sum is σ = 263342510. Its totient is φ = 263342508.

The previous prime is 263342477. The next prime is 263342543. The reversal of 263342509 is 905243362.

It is an a-pointer prime, because the next prime (263342543) can be obtained adding 263342509 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 263153284 + 189225 = 16222^2 + 435^2 .

It is a cyclic number.

It is not a de Polignac number, because 263342509 - 2⁵ = 263342477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263342809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131671254 + 131671255.

It is an arithmetic number, because the mean of its divisors is an integer number (131671255).

Almost surely, 2^263342509 is an apocalyptic number.

It is an amenable number.

263342509 is a deficient number, since it is larger than the sum of its proper divisors (1).

263342509 is an equidigital number, since it uses as much as digits as its factorization.

263342509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 34.

The square root of 263342509 is about 16227.8313092046. The cubic root of 263342509 is about 640.9738664696.

The spelling of 263342509 in words is "two hundred sixty-three million, three hundred forty-two thousand, five hundred nine".