6441965 has 4 divisors (see below), whose sum is σ = 7730364. Its totient is φ = 5153568.

The previous prime is 6441949. The next prime is 6441977. The reversal of 6441965 is 5691446.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5691446 = 2 ⋅2845723.

It can be written as a sum of positive squares in 2 ways, for example, as 1142761 + 5299204 = 1069^2 + 2302^2 .

It is a cyclic number.

It is not a de Polignac number, because 6441965 - 2⁴ = 6441949 is a prime.

It is a super-2 number, since 2×6441965² = 82997826122450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 644192 + ... + 644201.

It is an arithmetic number, because the mean of its divisors is an integer number (1932591).

Almost surely, 2^6441965 is an apocalyptic number.

It is an amenable number.

6441965 is a deficient number, since it is larger than the sum of its proper divisors (1288399).

6441965 is a wasteful number, since it uses less digits than its factorization.

6441965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1288398.

The product of its digits is 25920, while the sum is 35.

The square root of 6441965 is about 2538.1026377986. The cubic root of 6441965 is about 186.0684701862.

The spelling of 6441965 in words is "six million, four hundred forty-one thousand, nine hundred sixty-five".