8391380885 has 4 divisors (see below), whose sum is σ = 10069657068. Its totient is φ = 6713104704.

The previous prime is 8391380843. The next prime is 8391380891. The reversal of 8391380885 is 5880831938.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5880831938 = 2 ⋅2940415969.

It can be written as a sum of positive squares in 2 ways, for example, as 1277133169 + 7114247716 = 35737^2 + 84346^2 .

It is a cyclic number.

It is not a de Polignac number, because 8391380885 - 2¹⁰ = 8391379861 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 839138084 + ... + 839138093.

It is an arithmetic number, because the mean of its divisors is an integer number (2517414267).

Almost surely, 2^8391380885 is an apocalyptic number.

It is an amenable number.

8391380885 is a deficient number, since it is larger than the sum of its proper divisors (1678276183).

8391380885 is a wasteful number, since it uses less digits than its factorization.

8391380885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1678276182.

The product of its (nonzero) digits is 1658880, while the sum is 53.

The square root of 8391380885 is about 91604.4807037298. The cubic root of 8391380885 is about 2032.0972029065.

The spelling of 8391380885 in words is "eight billion, three hundred ninety-one million, three hundred eighty thousand, eight hundred eighty-five".