10218709 has 2 divisors, whose sum is σ = 10218710. Its totient is φ = 10218708.

The previous prime is 10218707. The next prime is 10218727. The reversal of 10218709 is 90781201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10099684 + 119025 = 3178^2 + 345^2 .

It is a cyclic number.

It is not a de Polignac number, because 10218709 - 2¹ = 10218707 is a prime.

Together with 10218707, 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 (10218707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5109354 + 5109355.

It is an arithmetic number, because the mean of its divisors is an integer number (5109355).

Almost surely, 2^10218709 is an apocalyptic number.

It is an amenable number.

10218709 is a deficient number, since it is larger than the sum of its proper divisors (1).

10218709 is an equidigital number, since it uses as much as digits as its factorization.

10218709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 10218709 is about 3196.6715502222. The cubic root of 10218709 is about 217.0028031662.

It can be divided in two parts, 1021 and 8709, that added together give a triangular number (9730 = T₁₃₉).

The spelling of 10218709 in words is "ten million, two hundred eighteen thousand, seven hundred nine".