6381491 has 2 divisors, whose sum is σ = 6381492. Its totient is φ = 6381490.

The previous prime is 6381481. The next prime is 6381497. The reversal of 6381491 is 1941836.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6381491 - 2¹⁰ = 6380467 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6381497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3190745 + 3190746.

It is an arithmetic number, because the mean of its divisors is an integer number (3190746).

Almost surely, 2^6381491 is an apocalyptic number.

6381491 is a deficient number, since it is larger than the sum of its proper divisors (1).

6381491 is an equidigital number, since it uses as much as digits as its factorization.

6381491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The square root of 6381491 is about 2526.1613170975. The cubic root of 6381491 is about 185.4843989272.

The spelling of 6381491 in words is "six million, three hundred eighty-one thousand, four hundred ninety-one".