6397419881 has 2 divisors, whose sum is σ = 6397419882. Its totient is φ = 6397419880.

The previous prime is 6397419857. The next prime is 6397419883. The reversal of 6397419881 is 1889147936.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6385448281 + 11971600 = 79909^2 + 3460^2 .

It is a cyclic number.

It is not a de Polignac number, because 6397419881 - 2¹⁰ = 6397418857 is a prime.

It is a super-2 number, since 2×6397419881² = 81853962267628108322, which contains 22 as substring.

Together with 6397419883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6397419883) 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, 3198709940 + 3198709941.

It is an arithmetic number, because the mean of its divisors is an integer number (3198709941).

Almost surely, 2^6397419881 is an apocalyptic number.

It is an amenable number.

6397419881 is a deficient number, since it is larger than the sum of its proper divisors (1).

6397419881 is an equidigital number, since it uses as much as digits as its factorization.

6397419881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 56.

The square root of 6397419881 is about 79983.8726306747. The cubic root of 6397419881 is about 1856.3860030028.

The spelling of 6397419881 in words is "six billion, three hundred ninety-seven million, four hundred nineteen thousand, eight hundred eighty-one".