255578549 has 2 divisors, whose sum is σ = 255578550. Its totient is φ = 255578548.

The previous prime is 255578503. The next prime is 255578551. The reversal of 255578549 is 945875552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 244140625 + 11437924 = 15625^2 + 3382^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255578549 is a prime.

Together with 255578551, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 255578497 and 255578506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255578749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127789274 + 127789275.

It is an arithmetic number, because the mean of its divisors is an integer number (127789275).

Almost surely, 2^255578549 is an apocalyptic number.

It is an amenable number.

255578549 is a deficient number, since it is larger than the sum of its proper divisors (1).

255578549 is an equidigital number, since it uses as much as digits as its factorization.

255578549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520000, while the sum is 50.

The square root of 255578549 is about 15986.8242312224. The cubic root of 255578549 is about 634.6117857734.

The spelling of 255578549 in words is "two hundred fifty-five million, five hundred seventy-eight thousand, five hundred forty-nine".