102009709 has 2 divisors, whose sum is σ = 102009710. Its totient is φ = 102009708.

The previous prime is 102009679. The next prime is 102009749. The reversal of 102009709 is 907900201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99560484 + 2449225 = 9978^2 + 1565^2 .

It is a cyclic number.

It is not a de Polignac number, because 102009709 - 2¹³ = 102001517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102009749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51004854 + 51004855.

It is an arithmetic number, because the mean of its divisors is an integer number (51004855).

Almost surely, 2^102009709 is an apocalyptic number.

It is an amenable number.

102009709 is a deficient number, since it is larger than the sum of its proper divisors (1).

102009709 is an equidigital number, since it uses as much as digits as its factorization.

102009709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1134, while the sum is 28.

The square root of 102009709 is about 10099.9855940491. The cubic root of 102009709 is about 467.2476970840.

The spelling of 102009709 in words is "one hundred two million, nine thousand, seven hundred nine".