6391043136 has 63 divisors (see below), whose sum is σ = 18324272343. Its totient is φ = 2129708160.

The previous prime is 6391043119. The next prime is 6391043147. The reversal of 6391043136 is 6313401936.

The square root of 6391043136 is 79944.

It is a perfect power (a square), and thus also a powerful number.

6391043136 is a `hidden beast` number, since 639 + 1 + 0 + 4 + 3 + 13 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 6391043136.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1916991 + ... + 1920321.

Almost surely, 2^6391043136 is an apocalyptic number.

6391043136 is the 79944-th square number.

It is an amenable number.

6391043136 is an abundant number, since it is smaller than the sum of its proper divisors (11933229207).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6391043136 is an frugal number, since it uses more digits than its factorization.

6391043136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6680 (or 3336 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 36.

The cubic root of 6391043136 is about 1855.7690024146.

Multiplying 6391043136 by its sum of digits (36), we get a square (230077552896 = 479664²).

6391043136 divided by its sum of digits (36) gives a square (177528976 = 13324²).

The spelling of 6391043136 in words is "six billion, three hundred ninety-one million, forty-three thousand, one hundred thirty-six".