10202009509 has 2 divisors, whose sum is σ = 10202009510. Its totient is φ = 10202009508.

The previous prime is 10202009507. The next prime is 10202009537. The reversal of 10202009509 is 90590020201.

It is an a-pointer prime, because the next prime (10202009537) can be obtained adding 10202009509 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9771322500 + 430687009 = 98850^2 + 20753^2 .

It is an emirp because it is prime and its reverse (90590020201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10202009509 - 2¹ = 10202009507 is a prime.

Together with 10202009507, 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 (10202009507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5101004754 + 5101004755.

It is an arithmetic number, because the mean of its divisors is an integer number (5101004755).

Almost surely, 2^10202009509 is an apocalyptic number.

It is an amenable number.

10202009509 is a deficient number, since it is larger than the sum of its proper divisors (1).

10202009509 is an equidigital number, since it uses as much as digits as its factorization.

10202009509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 28.

The spelling of 10202009509 in words is "ten billion, two hundred two million, nine thousand, five hundred nine".