4091784861 has 4 divisors (see below), whose sum is σ = 5455713152. Its totient is φ = 2727856572.

The previous prime is 4091784857. The next prime is 4091784877. The reversal of 4091784861 is 1684871904.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 4091784861 - 2² = 4091784857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4091784861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4091784061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 681964141 + ... + 681964146.

It is an arithmetic number, because the mean of its divisors is an integer number (1363928288).

Almost surely, 2^4091784861 is an apocalyptic number.

It is an amenable number.

4091784861 is a deficient number, since it is larger than the sum of its proper divisors (1363928291).

4091784861 is a wasteful number, since it uses less digits than its factorization.

4091784861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1363928290.

The product of its (nonzero) digits is 387072, while the sum is 48.

The square root of 4091784861 is about 63967.0607500454. The cubic root of 4091784861 is about 1599.4509653982.

The spelling of 4091784861 in words is "four billion, ninety-one million, seven hundred eighty-four thousand, eight hundred sixty-one".