4491236909 has 2 divisors, whose sum is σ = 4491236910. Its totient is φ = 4491236908.

The previous prime is 4491236903. The next prime is 4491236917. The reversal of 4491236909 is 9096321944.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4490340100 + 896809 = 67010^2 + 947^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4491236909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4491236903) 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, 2245618454 + 2245618455.

It is an arithmetic number, because the mean of its divisors is an integer number (2245618455).

Almost surely, 2^4491236909 is an apocalyptic number.

It is an amenable number.

4491236909 is a deficient number, since it is larger than the sum of its proper divisors (1).

4491236909 is an equidigital number, since it uses as much as digits as its factorization.

4491236909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 419904, while the sum is 47.

The square root of 4491236909 is about 67016.6912716526. The cubic root of 4491236909 is about 1649.8912580923.

The spelling of 4491236909 in words is "four billion, four hundred ninety-one million, two hundred thirty-six thousand, nine hundred nine".