4786781991 has 8 divisors (see below), whose sum is σ = 6383036784. Its totient is φ = 3190857600.

The previous prime is 4786781977. The next prime is 4786781999. The reversal of 4786781991 is 1991876874.

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

It is not a de Polignac number, because 4786781991 - 2⁹ = 4786781479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4786781999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46546 + ... + 108351.

It is an arithmetic number, because the mean of its divisors is an integer number (797879598).

Almost surely, 2^4786781991 is an apocalyptic number.

4786781991 is a deficient number, since it is larger than the sum of its proper divisors (1596254793).

4786781991 is a wasteful number, since it uses less digits than its factorization.

4786781991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165201.

The product of its digits is 6096384, while the sum is 60.

The square root of 4786781991 is about 69186.5737769981. The cubic root of 4786781991 is about 1685.3155042637.

The spelling of 4786781991 in words is "four billion, seven hundred eighty-six million, seven hundred eighty-one thousand, nine hundred ninety-one".