4891906805 has 8 divisors (see below), whose sum is σ = 5936247000. Its totient is φ = 3869552896.

The previous prime is 4891906787. The next prime is 4891906819. The reversal of 4891906805 is 5086091984.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 95374756 + 4796532049 = 9766^2 + 69257^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4891906805 - 2⁶ = 4891906741 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5496080 + ... + 5496969.

It is an arithmetic number, because the mean of its divisors is an integer number (742030875).

Almost surely, 2^4891906805 is an apocalyptic number.

It is an amenable number.

4891906805 is a deficient number, since it is larger than the sum of its proper divisors (1044340195).

4891906805 is a wasteful number, since it uses less digits than its factorization.

4891906805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10993143.

The product of its (nonzero) digits is 622080, while the sum is 50.

The square root of 4891906805 is about 69942.1675743610. The cubic root of 4891906805 is about 1697.5636154576.

The spelling of 4891906805 in words is "four billion, eight hundred ninety-one million, nine hundred six thousand, eight hundred five".