4491380989 has 2 divisors, whose sum is σ = 4491380990. Its totient is φ = 4491380988.

The previous prime is 4491380947. The next prime is 4491381031. The reversal of 4491380989 is 9890831944.

It is a balanced prime because it is at equal distance from previous prime (4491380947) and next prime (4491381031).

It can be written as a sum of positive squares in only one way, i.e., 3012363225 + 1479017764 = 54885^2 + 38458^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4491380989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4491380939) 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, 2245690494 + 2245690495.

It is an arithmetic number, because the mean of its divisors is an integer number (2245690495).

Almost surely, 2^4491380989 is an apocalyptic number.

It is an amenable number.

4491380989 is a deficient number, since it is larger than the sum of its proper divisors (1).

4491380989 is an equidigital number, since it uses as much as digits as its factorization.

4491380989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2239488, while the sum is 55.

The square root of 4491380989 is about 67017.7662191154. The cubic root of 4491380989 is about 1649.9089008779.

The spelling of 4491380989 in words is "four billion, four hundred ninety-one million, three hundred eighty thousand, nine hundred eighty-nine".