255145909 has 2 divisors, whose sum is σ = 255145910. Its totient is φ = 255145908.

The previous prime is 255145907. The next prime is 255145931. The reversal of 255145909 is 909541552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 228674884 + 26471025 = 15122^2 + 5145^2 .

It is a cyclic number.

It is not a de Polignac number, because 255145909 - 2¹ = 255145907 is a prime.

Together with 255145907, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255145907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127572954 + 127572955.

It is an arithmetic number, because the mean of its divisors is an integer number (127572955).

Almost surely, 2^255145909 is an apocalyptic number.

It is an amenable number.

255145909 is a deficient number, since it is larger than the sum of its proper divisors (1).

255145909 is an equidigital number, since it uses as much as digits as its factorization.

255145909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81000, while the sum is 40.

The square root of 255145909 is about 15973.2873573351. The cubic root of 255145909 is about 634.2534960383.

The spelling of 255145909 in words is "two hundred fifty-five million, one hundred forty-five thousand, nine hundred nine".