247016509 has 2 divisors, whose sum is σ = 247016510. Its totient is φ = 247016508.

The previous prime is 247016507. The next prime is 247016543. The reversal of 247016509 is 905610742.

It is an a-pointer prime, because the next prime (247016543) can be obtained adding 247016509 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 231192025 + 15824484 = 15205^2 + 3978^2 .

It is a cyclic number.

It is not a de Polignac number, because 247016509 - 2¹ = 247016507 is a prime.

It is a super-2 number, since 2×247016509² = 122034311437094162, which contains 22 as substring.

Together with 247016507, 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 (247016501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123508254 + 123508255.

It is an arithmetic number, because the mean of its divisors is an integer number (123508255).

Almost surely, 2^247016509 is an apocalyptic number.

It is an amenable number.

247016509 is a deficient number, since it is larger than the sum of its proper divisors (1).

247016509 is an equidigital number, since it uses as much as digits as its factorization.

247016509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 247016509 is about 15716.7588579834. The cubic root of 247016509 is about 627.4445141756. Note that the first 3 decimals are identical.

The spelling of 247016509 in words is "two hundred forty-seven million, sixteen thousand, five hundred nine".