9865440001 has 2 divisors, whose sum is σ = 9865440002. Its totient is φ = 9865440000.

The previous prime is 9865439993. The next prime is 9865440019. The reversal of 9865440001 is 1000445689.

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., 9840838401 + 24601600 = 99201^2 + 4960^2 .

It is a cyclic number.

It is not a de Polignac number, because 9865440001 - 2³ = 9865439993 is a prime.

It is not a weakly prime, because it can be changed into another prime (9865540001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4932720000 + 4932720001.

It is an arithmetic number, because the mean of its divisors is an integer number (4932720001).

Almost surely, 2^9865440001 is an apocalyptic number.

It is an amenable number.

9865440001 is a deficient number, since it is larger than the sum of its proper divisors (1).

9865440001 is an equidigital number, since it uses as much as digits as its factorization.

9865440001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 9865440001 is about 99324.9213490753. The cubic root of 9865440001 is about 2144.7276620427.

The spelling of 9865440001 in words is "nine billion, eight hundred sixty-five million, four hundred forty thousand, one".