6381961 has 2 divisors, whose sum is σ = 6381962. Its totient is φ = 6381960.

The previous prime is 6381941. The next prime is 6381979. The reversal of 6381961 is 1691836.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3385600 + 2996361 = 1840^2 + 1731^2 .

It is a cyclic number.

It is not a de Polignac number, because 6381961 - 2¹³ = 6373769 is a prime.

It is not a weakly prime, because it can be changed into another prime (6381911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3190980 + 3190981.

It is an arithmetic number, because the mean of its divisors is an integer number (3190981).

Almost surely, 2^6381961 is an apocalyptic number.

It is an amenable number.

6381961 is a deficient number, since it is larger than the sum of its proper divisors (1).

6381961 is an equidigital number, since it uses as much as digits as its factorization.

6381961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 34.

The square root of 6381961 is about 2526.2543419062. The cubic root of 6381961 is about 185.4889524883.

The spelling of 6381961 in words is "six million, three hundred eighty-one thousand, nine hundred sixty-one".