6481864381 has 2 divisors, whose sum is σ = 6481864382. Its totient is φ = 6481864380.

The previous prime is 6481864289. The next prime is 6481864409. The reversal of 6481864381 is 1834681846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5608661881 + 873202500 = 74891^2 + 29550^2 .

It is a cyclic number.

It is not a de Polignac number, because 6481864381 - 2¹⁷ = 6481733309 is a prime.

It is a super-2 number, since 2×6481864381² = 84029131707353026322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6481864681) 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, 3240932190 + 3240932191.

It is an arithmetic number, because the mean of its divisors is an integer number (3240932191).

Almost surely, 2^6481864381 is an apocalyptic number.

It is an amenable number.

6481864381 is a deficient number, since it is larger than the sum of its proper divisors (1).

6481864381 is an equidigital number, since it uses as much as digits as its factorization.

6481864381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 884736, while the sum is 49.

The square root of 6481864381 is about 80510.0265867550. The cubic root of 6481864381 is about 1864.5182847376.

The spelling of 6481864381 in words is "six billion, four hundred eighty-one million, eight hundred sixty-four thousand, three hundred eighty-one".