255021289 has 2 divisors, whose sum is σ = 255021290. Its totient is φ = 255021288.

The previous prime is 255021259. The next prime is 255021311. The reversal of 255021289 is 982120552.

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., 237314025 + 17707264 = 15405^2 + 4208^2 .

It is a cyclic number.

It is not a de Polignac number, because 255021289 - 2⁵ = 255021257 is a prime.

It is not a weakly prime, because it can be changed into another prime (255021259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127510644 + 127510645.

It is an arithmetic number, because the mean of its divisors is an integer number (127510645).

Almost surely, 2^255021289 is an apocalyptic number.

It is an amenable number.

255021289 is a deficient number, since it is larger than the sum of its proper divisors (1).

255021289 is an equidigital number, since it uses as much as digits as its factorization.

255021289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 255021289 is about 15969.3859932059. The cubic root of 255021289 is about 634.1502171694.

The spelling of 255021289 in words is "two hundred fifty-five million, twenty-one thousand, two hundred eighty-nine".