6395887961 has 2 divisors, whose sum is σ = 6395887962. Its totient is φ = 6395887960.

The previous prime is 6395887957. The next prime is 6395887963. The reversal of 6395887961 is 1697885936.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6028590736 + 367297225 = 77644^2 + 19165^2 .

It is a cyclic number.

It is not a de Polignac number, because 6395887961 - 2² = 6395887957 is a prime.

Together with 6395887963, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 6395887894 and 6395887903.

It is not a weakly prime, because it can be changed into another prime (6395887963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3197943980 + 3197943981.

It is an arithmetic number, because the mean of its divisors is an integer number (3197943981).

Almost surely, 2^6395887961 is an apocalyptic number.

It is an amenable number.

6395887961 is a deficient number, since it is larger than the sum of its proper divisors (1).

6395887961 is an equidigital number, since it uses as much as digits as its factorization.

6395887961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19595520, while the sum is 62.

The square root of 6395887961 is about 79974.2956267825. The cubic root of 6395887961 is about 1856.2378150394.

The spelling of 6395887961 in words is "six billion, three hundred ninety-five million, eight hundred eighty-seven thousand, nine hundred sixty-one".