6928221197 has 4 divisors (see below), whose sum is σ = 6928388796. Its totient is φ = 6928053600.

The previous prime is 6928221187. The next prime is 6928221203. The reversal of 6928221197 is 7911228296.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4544242921 + 2383978276 = 67411^2 + 48826^2 .

It is a cyclic number.

It is not a de Polignac number, because 6928221197 - 2²⁰ = 6927172621 is a prime.

It is a super-2 number, since 2×6928221197² = 96000497909120225618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6928221127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27353 + ... + 120849.

It is an arithmetic number, because the mean of its divisors is an integer number (1732097199).

Almost surely, 2^6928221197 is an apocalyptic number.

It is an amenable number.

6928221197 is a deficient number, since it is larger than the sum of its proper divisors (167599).

6928221197 is an equidigital number, since it uses as much as digits as its factorization.

6928221197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167598.

The product of its digits is 217728, while the sum is 47.

The square root of 6928221197 is about 83235.9369323131. The cubic root of 6928221197 is about 1906.3702339040.

The spelling of 6928221197 in words is "six billion, nine hundred twenty-eight million, two hundred twenty-one thousand, one hundred ninety-seven".