255578749 has 2 divisors, whose sum is σ = 255578750. Its totient is φ = 255578748.

The previous prime is 255578723. The next prime is 255578761. The reversal of 255578749 is 947875552.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151905625 + 103673124 = 12325^2 + 10182^2 .

It is a cyclic number.

It is not a de Polignac number, because 255578749 - 2⁵ = 255578717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 255578696 and 255578705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255578549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127789374 + 127789375.

It is an arithmetic number, because the mean of its divisors is an integer number (127789375).

Almost surely, 2^255578749 is an apocalyptic number.

It is an amenable number.

255578749 is a deficient number, since it is larger than the sum of its proper divisors (1).

255578749 is an equidigital number, since it uses as much as digits as its factorization.

255578749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528000, while the sum is 52.

The square root of 255578749 is about 15986.8304863722. The cubic root of 255578749 is about 634.6119513093.

The spelling of 255578749 in words is "two hundred fifty-five million, five hundred seventy-eight thousand, seven hundred forty-nine".