255723917 has 2 divisors, whose sum is σ = 255723918. Its totient is φ = 255723916.

The previous prime is 255723893. The next prime is 255723931. The reversal of 255723917 is 719327552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198781801 + 56942116 = 14099^2 + 7546^2 .

It is a cyclic number.

It is not a de Polignac number, because 255723917 - 2¹⁰ = 255722893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255723217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127861958 + 127861959.

It is an arithmetic number, because the mean of its divisors is an integer number (127861959).

Almost surely, 2^255723917 is an apocalyptic number.

It is an amenable number.

255723917 is a deficient number, since it is larger than the sum of its proper divisors (1).

255723917 is an equidigital number, since it uses as much as digits as its factorization.

255723917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 132300, while the sum is 41.

The square root of 255723917 is about 15991.3700788894. The cubic root of 255723917 is about 634.7320811601.

The spelling of 255723917 in words is "two hundred fifty-five million, seven hundred twenty-three thousand, nine hundred seventeen".