255797009 has 4 divisors (see below), whose sum is σ = 275473716. Its totient is φ = 236120304.

The previous prime is 255796999. The next prime is 255797029. The reversal of 255797009 is 900797552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 94633984 + 161163025 = 9728^2 + 12695^2 .

It is a cyclic number.

It is not a de Polignac number, because 255797009 - 2²⁰ = 254748433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (255797029) 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, 9838334 + ... + 9838359.

It is an arithmetic number, because the mean of its divisors is an integer number (68868429).

Almost surely, 2^255797009 is an apocalyptic number.

It is an amenable number.

255797009 is a deficient number, since it is larger than the sum of its proper divisors (19676707).

255797009 is a wasteful number, since it uses less digits than its factorization.

255797009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19676706.

The product of its (nonzero) digits is 198450, while the sum is 44.

The square root of 255797009 is about 15993.6552732638. The cubic root of 255797009 is about 634.7925492597.

The spelling of 255797009 in words is "two hundred fifty-five million, seven hundred ninety-seven thousand, nine".