6817891149 has 16 divisors (see below), whose sum is σ = 10102800000. Its totient is φ = 4544261568.

The previous prime is 6817891133. The next prime is 6817891151. The reversal of 6817891149 is 9411987186.

It is not a de Polignac number, because 6817891149 - 2⁴ = 6817891133 is a prime.

It is a super-2 number, since 2×6817891149² = 92967279439225080402, which contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 6817891095 and 6817891104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6817891849) 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, 109717 + ... + 160229.

It is an arithmetic number, because the mean of its divisors is an integer number (631425000).

Almost surely, 2^6817891149 is an apocalyptic number.

It is an amenable number.

6817891149 is a deficient number, since it is larger than the sum of its proper divisors (3284908851).

6817891149 is a wasteful number, since it uses less digits than its factorization.

6817891149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55521 (or 55515 counting only the distinct ones).

The product of its digits is 870912, while the sum is 54.

The square root of 6817891149 is about 82570.5222764153. The cubic root of 6817891149 is about 1896.1965601977.

The spelling of 6817891149 in words is "six billion, eight hundred seventeen million, eight hundred ninety-one thousand, one hundred forty-nine".