6147221 has 2 divisors, whose sum is σ = 6147222. Its totient is φ = 6147220.

The previous prime is 6147199. The next prime is 6147223. The reversal of 6147221 is 1227416.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4906225 + 1240996 = 2215^2 + 1114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6147221 is a prime.

Together with 6147223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6147223) 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, 3073610 + 3073611.

It is an arithmetic number, because the mean of its divisors is an integer number (3073611).

Almost surely, 2^6147221 is an apocalyptic number.

It is an amenable number.

6147221 is a deficient number, since it is larger than the sum of its proper divisors (1).

6147221 is an equidigital number, since it uses as much as digits as its factorization.

6147221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 23.

The square root of 6147221 is about 2479.3589897391. The cubic root of 6147221 is about 183.1862795068.

The spelling of 6147221 in words is "six million, one hundred forty-seven thousand, two hundred twenty-one".