6651571 has 2 divisors, whose sum is σ = 6651572. Its totient is φ = 6651570.

The previous prime is 6651523. The next prime is 6651583. The reversal of 6651571 is 1751566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6651571 - 2¹⁷ = 6520499 is a prime.

It is not a weakly prime, because it can be changed into another prime (6651521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3325785 + 3325786.

It is an arithmetic number, because the mean of its divisors is an integer number (3325786).

Almost surely, 2^6651571 is an apocalyptic number.

6651571 is a deficient number, since it is larger than the sum of its proper divisors (1).

6651571 is an equidigital number, since it uses as much as digits as its factorization.

6651571 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6300, while the sum is 31.

The square root of 6651571 is about 2579.0639774926. The cubic root of 6651571 is about 188.0650427577.

The spelling of 6651571 in words is "six million, six hundred fifty-one thousand, five hundred seventy-one".