2184778491 has 16 divisors (see below), whose sum is σ = 3333585408. Its totient is φ = 1246795200.

The previous prime is 2184778469. The next prime is 2184778493. The reversal of 2184778491 is 1948774812.

It is not a de Polignac number, because 2184778491 - 2⁵ = 2184778459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2184778493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52375 + ... + 84336.

It is an arithmetic number, because the mean of its divisors is an integer number (208349088).

Almost surely, 2^2184778491 is an apocalyptic number.

2184778491 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2184778491 is a deficient number, since it is larger than the sum of its proper divisors (1148806917).

2184778491 is a wasteful number, since it uses less digits than its factorization.

2184778491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137482.

The product of its digits is 903168, while the sum is 51.

The square root of 2184778491 is about 46741.6141248888. The cubic root of 2184778491 is about 1297.5849622677.

The spelling of 2184778491 in words is "two billion, one hundred eighty-four million, seven hundred seventy-eight thousand, four hundred ninety-one".