201029509 has 2 divisors, whose sum is σ = 201029510. Its totient is φ = 201029508.

The previous prime is 201029501. The next prime is 201029531. The reversal of 201029509 is 905920102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111197025 + 89832484 = 10545^2 + 9478^2 .

It is a cyclic number.

It is not a de Polignac number, because 201029509 - 2³ = 201029501 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201029501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100514754 + 100514755.

It is an arithmetic number, because the mean of its divisors is an integer number (100514755).

Almost surely, 2^201029509 is an apocalyptic number.

It is an amenable number.

201029509 is a deficient number, since it is larger than the sum of its proper divisors (1).

201029509 is an equidigital number, since it uses as much as digits as its factorization.

201029509 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 square root of 201029509 is about 14178.4875427529. The cubic root of 201029509 is about 585.8052650011.

The spelling of 201029509 in words is "two hundred one million, twenty-nine thousand, five hundred nine".