247775009 has 2 divisors, whose sum is σ = 247775010. Its totient is φ = 247775008.

The previous prime is 247774963. The next prime is 247775027. The reversal of 247775009 is 900577742.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223054225 + 24720784 = 14935^2 + 4972^2 .

It is a cyclic number.

It is not a de Polignac number, because 247775009 - 2²⁰ = 246726433 is a prime.

It is a super-3 number, since 3×247775009³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (247775609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123887504 + 123887505.

It is an arithmetic number, because the mean of its divisors is an integer number (123887505).

Almost surely, 2^247775009 is an apocalyptic number.

It is an amenable number.

247775009 is a deficient number, since it is larger than the sum of its proper divisors (1).

247775009 is an equidigital number, since it uses as much as digits as its factorization.

247775009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 123480, while the sum is 41.

The square root of 247775009 is about 15740.8706557166. The cubic root of 247775009 is about 628.0860777314.

The spelling of 247775009 in words is "two hundred forty-seven million, seven hundred seventy-five thousand, nine".