2009947969 has 2 divisors, whose sum is σ = 2009947970. Its totient is φ = 2009947968.

The previous prime is 2009947843. The next prime is 2009947993. The reversal of 2009947969 is 9697499002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1923699600 + 86248369 = 43860^2 + 9287^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2009947969 is a prime.

It is a super-2 number, since 2×2009947969² = 8079781676174449922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2009947169) 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, 1004973984 + 1004973985.

It is an arithmetic number, because the mean of its divisors is an integer number (1004973985).

Almost surely, 2^2009947969 is an apocalyptic number.

It is an amenable number.

2009947969 is a deficient number, since it is larger than the sum of its proper divisors (1).

2009947969 is an equidigital number, since it uses as much as digits as its factorization.

2009947969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2204496, while the sum is 55.

The square root of 2009947969 is about 44832.4432637794. The cubic root of 2009947969 is about 1262.0065385690.

The spelling of 2009947969 in words is "two billion, nine million, nine hundred forty-seven thousand, nine hundred sixty-nine".