6819951889 has 9 divisors (see below), whose sum is σ = 6867769467. Its totient is φ = 6772466664.

The previous prime is 6819951883. The next prime is 6819951893. The reversal of 6819951889 is 9881599186.

The square root of 6819951889 is 82583.

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

It can be written as a sum of positive squares in only one way, i.e., 448719489 + 6371232400 = 21183^2 + 79820^2 .

It is not a de Polignac number, because 6819951889 - 2¹⁷ = 6819820817 is a prime.

It is a Duffinian number.

Its product of digits (11197440) is a multiple of the sum of its prime divisors (576).

It is a self number, because there is not a number n which added to its sum of digits gives 6819951889.

It is not an unprimeable number, because it can be changed into a prime (6819951883) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 22214674 + ... + 22214980.

Almost surely, 2^6819951889 is an apocalyptic number.

6819951889 is the 82583-rd square number.

6819951889 is the 41292-nd centered octagonal number.

It is an amenable number.

6819951889 is a deficient number, since it is larger than the sum of its proper divisors (47817578).

6819951889 is an frugal number, since it uses more digits than its factorization.

6819951889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1152 (or 576 counting only the distinct ones).

The product of its digits is 11197440, while the sum is 64.

The cubic root of 6819951889 is about 1896.3875857601.

Multiplying 6819951889 by its sum of digits (64), we get a square (436476920896 = 660664²).

The spelling of 6819951889 in words is "six billion, eight hundred nineteen million, nine hundred fifty-one thousand, eight hundred eighty-nine".