255692561 has 2 divisors, whose sum is σ = 255692562. Its totient is φ = 255692560.

The previous prime is 255692537. The next prime is 255692579. The reversal of 255692561 is 165296552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 252651025 + 3041536 = 15895^2 + 1744^2 .

It is a cyclic number.

It is not a de Polignac number, because 255692561 - 2⁶ = 255692497 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (255692581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127846280 + 127846281.

It is an arithmetic number, because the mean of its divisors is an integer number (127846281).

Almost surely, 2^255692561 is an apocalyptic number.

It is an amenable number.

255692561 is a deficient number, since it is larger than the sum of its proper divisors (1).

255692561 is an equidigital number, since it uses as much as digits as its factorization.

255692561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162000, while the sum is 41.

The square root of 255692561 is about 15990.3896450337. The cubic root of 255692561 is about 634.7061372009.

The spelling of 255692561 in words is "two hundred fifty-five million, six hundred ninety-two thousand, five hundred sixty-one".