6977221 has 2 divisors, whose sum is σ = 6977222. Its totient is φ = 6977220.

The previous prime is 6977219. The next prime is 6977227. The reversal of 6977221 is 1227796.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6502500 + 474721 = 2550^2 + 689^2 .

It is a cyclic number.

It is not a de Polignac number, because 6977221 - 2¹ = 6977219 is a prime.

It is a super-2 number, since 2×6977221² = 97363225765682, which contains 22 as substring.

Together with 6977219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6977227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3488610 + 3488611.

It is an arithmetic number, because the mean of its divisors is an integer number (3488611).

Almost surely, 2^6977221 is an apocalyptic number.

It is an amenable number.

6977221 is a deficient number, since it is larger than the sum of its proper divisors (1).

6977221 is an equidigital number, since it uses as much as digits as its factorization.

6977221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10584, while the sum is 34.

The square root of 6977221 is about 2641.4429768594. The cubic root of 6977221 is about 191.0853944148.

The spelling of 6977221 in words is "six million, nine hundred seventy-seven thousand, two hundred twenty-one".