9801129509 has 2 divisors, whose sum is σ = 9801129510. Its totient is φ = 9801129508.

The previous prime is 9801129469. The next prime is 9801129551. The reversal of 9801129509 is 9059211089.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5750188900 + 4050940609 = 75830^2 + 63647^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9801129509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9801129509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9801129109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4900564754 + 4900564755.

It is an arithmetic number, because the mean of its divisors is an integer number (4900564755).

Almost surely, 2^9801129509 is an apocalyptic number.

It is an amenable number.

9801129509 is a deficient number, since it is larger than the sum of its proper divisors (1).

9801129509 is an equidigital number, since it uses as much as digits as its factorization.

9801129509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 58320, while the sum is 44.

The square root of 9801129509 is about 99000.6540836979. The cubic root of 9801129509 is about 2140.0571729710.

The spelling of 9801129509 in words is "nine billion, eight hundred one million, one hundred twenty-nine thousand, five hundred nine".