6423661 has 2 divisors, whose sum is σ = 6423662. Its totient is φ = 6423660.

The previous prime is 6423649. The next prime is 6423673. The reversal of 6423661 is 1663246.

It is a balanced prime because it is at equal distance from previous prime (6423649) and next prime (6423673).

It can be written as a sum of positive squares in only one way, i.e., 3802500 + 2621161 = 1950^2 + 1619^2 .

It is a cyclic number.

It is not a de Polignac number, because 6423661 - 2⁵ = 6423629 is a prime.

6423661 is a lucky number.

It is equal to p₄₃₉₉₁₂ and since 6423661 and 439912 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6423611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3211830 + 3211831.

It is an arithmetic number, because the mean of its divisors is an integer number (3211831).

Almost surely, 2^6423661 is an apocalyptic number.

It is an amenable number.

6423661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6423661 is an equidigital number, since it uses as much as digits as its factorization.

6423661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 28.

The square root of 6423661 is about 2534.4942296245. The cubic root of 6423661 is about 185.8920732799.

The spelling of 6423661 in words is "six million, four hundred twenty-three thousand, six hundred sixty-one".