255719561 has 2 divisors, whose sum is σ = 255719562. Its totient is φ = 255719560.

The previous prime is 255719549. The next prime is 255719567. The reversal of 255719561 is 165917552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 251032336 + 4687225 = 15844^2 + 2165^2 .

It is a cyclic number.

It is not a de Polignac number, because 255719561 - 2¹⁰ = 255718537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (255719567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127859780 + 127859781.

It is an arithmetic number, because the mean of its divisors is an integer number (127859781).

Almost surely, 2^255719561 is an apocalyptic number.

It is an amenable number.

255719561 is a deficient number, since it is larger than the sum of its proper divisors (1).

255719561 is an equidigital number, since it uses as much as digits as its factorization.

255719561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94500, while the sum is 41.

The square root of 255719561 is about 15991.2338798480. The cubic root of 255719561 is about 634.7284771319.

The spelling of 255719561 in words is "two hundred fifty-five million, seven hundred nineteen thousand, five hundred sixty-one".