255517261 has 2 divisors, whose sum is σ = 255517262. Its totient is φ = 255517260.

The previous prime is 255517253. The next prime is 255517271. The reversal of 255517261 is 162715552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188375625 + 67141636 = 13725^2 + 8194^2 .

It is a cyclic number.

It is not a de Polignac number, because 255517261 - 2³ = 255517253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255517211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127758630 + 127758631.

It is an arithmetic number, because the mean of its divisors is an integer number (127758631).

Almost surely, 2^255517261 is an apocalyptic number.

It is an amenable number.

255517261 is a deficient number, since it is larger than the sum of its proper divisors (1).

255517261 is an equidigital number, since it uses as much as digits as its factorization.

255517261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21000, while the sum is 34.

The square root of 255517261 is about 15984.9072878137. The cubic root of 255517261 is about 634.5610548642.

The spelling of 255517261 in words is "two hundred fifty-five million, five hundred seventeen thousand, two hundred sixty-one".