6469631891 has 2 divisors, whose sum is σ = 6469631892. Its totient is φ = 6469631890.

The previous prime is 6469631873. The next prime is 6469631923. The reversal of 6469631891 is 1981369646.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6469631891 is a prime.

It is a super-2 number, since 2×6469631891² = 83712273610088471762, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (6469631801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3234815945 + 3234815946.

It is an arithmetic number, because the mean of its divisors is an integer number (3234815946).

Almost surely, 2^6469631891 is an apocalyptic number.

6469631891 is a deficient number, since it is larger than the sum of its proper divisors (1).

6469631891 is an equidigital number, since it uses as much as digits as its factorization.

6469631891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 53.

The square root of 6469631891 is about 80434.0219745351. The cubic root of 6469631891 is about 1863.3446479330.

The spelling of 6469631891 in words is "six billion, four hundred sixty-nine million, six hundred thirty-one thousand, eight hundred ninety-one".