201200100509 has 2 divisors, whose sum is σ = 201200100510. Its totient is φ = 201200100508.

The previous prime is 201200100467. The next prime is 201200100533. The reversal of 201200100509 is 905001002102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150753592900 + 50446507609 = 388270^2 + 224603^2 .

It is a cyclic number.

It is not a de Polignac number, because 201200100509 - 2⁸ = 201200100253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201200100539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100600050254 + 100600050255.

It is an arithmetic number, because the mean of its divisors is an integer number (100600050255).

Almost surely, 2^201200100509 is an apocalyptic number.

It is an amenable number.

201200100509 is a deficient number, since it is larger than the sum of its proper divisors (1).

201200100509 is an equidigital number, since it uses as much as digits as its factorization.

201200100509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 20.

The spelling of 201200100509 in words is "two hundred one billion, two hundred million, one hundred thousand, five hundred nine".