255818247 has 4 divisors (see below), whose sum is σ = 341091000. Its totient is φ = 170545496.

The previous prime is 255818243. The next prime is 255818257. The reversal of 255818247 is 742818552.

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

It is a cyclic number.

It is not a de Polignac number, because 255818247 - 2² = 255818243 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 255818199 and 255818208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255818243) 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, 42636372 + ... + 42636377.

It is an arithmetic number, because the mean of its divisors is an integer number (85272750).

Almost surely, 2^255818247 is an apocalyptic number.

255818247 is a deficient number, since it is larger than the sum of its proper divisors (85272753).

255818247 is an equidigital number, since it uses as much as digits as its factorization.

255818247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85272752.

The product of its digits is 179200, while the sum is 42.

The square root of 255818247 is about 15994.3192102696. The cubic root of 255818247 is about 634.8101170323.

The spelling of 255818247 in words is "two hundred fifty-five million, eight hundred eighteen thousand, two hundred forty-seven".