255204509 has 4 divisors (see below), whose sum is σ = 291662304. Its totient is φ = 218746716.

The previous prime is 255204463. The next prime is 255204517. The reversal of 255204509 is 905402552.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255204509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255204539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18228887 + ... + 18228900.

It is an arithmetic number, because the mean of its divisors is an integer number (72915576).

Almost surely, 2^255204509 is an apocalyptic number.

It is an amenable number.

255204509 is a deficient number, since it is larger than the sum of its proper divisors (36457795).

255204509 is an equidigital number, since it uses as much as digits as its factorization.

255204509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36457794.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 255204509 is about 15975.1215644827. The cubic root of 255204509 is about 634.3020491844.

The spelling of 255204509 in words is "two hundred fifty-five million, two hundred four thousand, five hundred nine".