6404261 has 2 divisors, whose sum is σ = 6404262. Its totient is φ = 6404260.

The previous prime is 6404249. The next prime is 6404263. The reversal of 6404261 is 1624046.

It is a happy number.

6404261 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5612161 + 792100 = 2369^2 + 890^2 .

It is a cyclic number.

It is not a de Polignac number, because 6404261 - 2¹⁴ = 6387877 is a prime.

It is a super-2 number, since 2×6404261² = 82029117912242, which contains 22 as substring.

Together with 6404263, 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 (6404263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3202130 + 3202131.

It is an arithmetic number, because the mean of its divisors is an integer number (3202131).

Almost surely, 2^6404261 is an apocalyptic number.

It is an amenable number.

6404261 is a deficient number, since it is larger than the sum of its proper divisors (1).

6404261 is an equidigital number, since it uses as much as digits as its factorization.

6404261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 6404261 is about 2530.6641420781. The cubic root of 6404261 is about 185.7047479745.

The spelling of 6404261 in words is "six million, four hundred four thousand, two hundred sixty-one".