9945437309 has 2 divisors, whose sum is σ = 9945437310. Its totient is φ = 9945437308.

The previous prime is 9945437287. The next prime is 9945437389. The reversal of 9945437309 is 9037345499.

It is a happy number.

9945437309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9880956409 + 64480900 = 99403^2 + 8030^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9945437309 is a prime.

It is a super-2 number, since 2×9945437309² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9945437389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4972718654 + 4972718655.

It is an arithmetic number, because the mean of its divisors is an integer number (4972718655).

Almost surely, 2^9945437309 is an apocalyptic number.

It is an amenable number.

9945437309 is a deficient number, since it is larger than the sum of its proper divisors (1).

9945437309 is an equidigital number, since it uses as much as digits as its factorization.

9945437309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3674160, while the sum is 53.

The square root of 9945437309 is about 99726.8133903816. The cubic root of 9945437309 is about 2150.5091499413.

The spelling of 9945437309 in words is "nine billion, nine hundred forty-five million, four hundred thirty-seven thousand, three hundred nine".