6391131133 has 4 divisors (see below), whose sum is σ = 6391943100. Its totient is φ = 6390319168.

The previous prime is 6391131121. The next prime is 6391131169. The reversal of 6391131133 is 3311311936.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1668967609 + 4722163524 = 40853^2 + 68718^2 .

It is a cyclic number.

It is not a de Polignac number, because 6391131133 - 2¹⁷ = 6391000061 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6391131095 and 6391131104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6391131533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 394060 + ... + 409957.

It is an arithmetic number, because the mean of its divisors is an integer number (1597985775).

Almost surely, 2^6391131133 is an apocalyptic number.

It is an amenable number.

6391131133 is a deficient number, since it is larger than the sum of its proper divisors (811967).

6391131133 is an equidigital number, since it uses as much as digits as its factorization.

6391131133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811966.

The product of its digits is 4374, while the sum is 31.

The square root of 6391131133 is about 79944.5503646121. The cubic root of 6391131133 is about 1855.7775196134. Note that the first 3 decimals are identical.

The spelling of 6391131133 in words is "six billion, three hundred ninety-one million, one hundred thirty-one thousand, one hundred thirty-three".