3891309889 has 2 divisors, whose sum is σ = 3891309890. Its totient is φ = 3891309888.

The previous prime is 3891309883. The next prime is 3891309893. The reversal of 3891309889 is 9889031983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1972869889 + 1918440000 = 44417^2 + 43800^2 .

It is an emirp because it is prime and its reverse (9889031983) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3891309889 - 2³ = 3891309881 is a prime.

It is not a weakly prime, because it can be changed into another prime (3891309881) 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, 1945654944 + 1945654945.

It is an arithmetic number, because the mean of its divisors is an integer number (1945654945).

Almost surely, 2^3891309889 is an apocalyptic number.

It is an amenable number.

3891309889 is a deficient number, since it is larger than the sum of its proper divisors (1).

3891309889 is an equidigital number, since it uses as much as digits as its factorization.

3891309889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3359232, while the sum is 58.

The square root of 3891309889 is about 62380.3646109896. The cubic root of 3891309889 is about 1572.8909220580.

The spelling of 3891309889 in words is "three billion, eight hundred ninety-one million, three hundred nine thousand, eight hundred eighty-nine".