9961472009 has 2 divisors, whose sum is σ = 9961472010. Its totient is φ = 9961472008.

The previous prime is 9961471991. The next prime is 9961472021. The reversal of 9961472009 is 9002741699.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9177640000 + 783832009 = 95800^2 + 27997^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9961472009 is a prime.

It is not a weakly prime, because it can be changed into another prime (9961472509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4980736004 + 4980736005.

It is an arithmetic number, because the mean of its divisors is an integer number (4980736005).

Almost surely, 2^9961472009 is an apocalyptic number.

It is an amenable number.

9961472009 is a deficient number, since it is larger than the sum of its proper divisors (1).

9961472009 is an equidigital number, since it uses as much as digits as its factorization.

9961472009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944, while the sum is 47.

The square root of 9961472009 is about 99807.1741359307. The cubic root of 9961472009 is about 2151.6642609993.

The spelling of 9961472009 in words is "nine billion, nine hundred sixty-one million, four hundred seventy-two thousand, nine".