6378961 has 4 divisors (see below), whose sum is σ = 6754212. Its totient is φ = 6003712.

The previous prime is 6378947. The next prime is 6378973. The reversal of 6378961 is 1698736.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4596736 + 1782225 = 2144^2 + 1335^2 .

It is a cyclic number.

It is not a de Polignac number, because 6378961 - 2¹³ = 6370769 is a prime.

It is a super-2 number, since 2×6378961² = 81382286879042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6378761) 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 in 3 ways as a sum of consecutive naturals, for example, 187600 + ... + 187633.

It is an arithmetic number, because the mean of its divisors is an integer number (1688553).

Almost surely, 2^6378961 is an apocalyptic number.

It is an amenable number.

6378961 is a deficient number, since it is larger than the sum of its proper divisors (375251).

6378961 is a wasteful number, since it uses less digits than its factorization.

6378961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375250.

The product of its digits is 54432, while the sum is 40.

The square root of 6378961 is about 2525.6605076692. The cubic root of 6378961 is about 185.4598833629.

The spelling of 6378961 in words is "six million, three hundred seventy-eight thousand, nine hundred sixty-one".