6381913 has 2 divisors, whose sum is σ = 6381914. Its totient is φ = 6381912.

The previous prime is 6381911. The next prime is 6381941. The reversal of 6381913 is 3191836.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6365529 + 16384 = 2523^2 + 128^2 .

It is a cyclic number.

It is not a de Polignac number, because 6381913 - 2¹ = 6381911 is a prime.

Together with 6381911, it forms a pair of twin primes.

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, 3190956 + 3190957.

It is an arithmetic number, because the mean of its divisors is an integer number (3190957).

Almost surely, 2^6381913 is an apocalyptic number.

It is an amenable number.

6381913 is a deficient number, since it is larger than the sum of its proper divisors (1).

6381913 is an equidigital number, since it uses as much as digits as its factorization.

6381913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 31.

The square root of 6381913 is about 2526.2448416573. The cubic root of 6381913 is about 185.4884874540.

The spelling of 6381913 in words is "six million, three hundred eighty-one thousand, nine hundred thirteen".