255191009 has 2 divisors, whose sum is σ = 255191010. Its totient is φ = 255191008.

The previous prime is 255190997. The next prime is 255191047. The reversal of 255191009 is 900191552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 227859025 + 27331984 = 15095^2 + 5228^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255191009 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (255191309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127595504 + 127595505.

It is an arithmetic number, because the mean of its divisors is an integer number (127595505).

Almost surely, 2^255191009 is an apocalyptic number.

It is an amenable number.

255191009 is a deficient number, since it is larger than the sum of its proper divisors (1).

255191009 is an equidigital number, since it uses as much as digits as its factorization.

255191009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4050, while the sum is 32.

The square root of 255191009 is about 15974.6990268988. The cubic root of 255191009 is about 634.2908643916.

The spelling of 255191009 in words is "two hundred fifty-five million, one hundred ninety-one thousand, nine".