6421748491 has 2 divisors, whose sum is σ = 6421748492. Its totient is φ = 6421748490.

The previous prime is 6421748483. The next prime is 6421748503. The reversal of 6421748491 is 1948471246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6421748491 - 2³ = 6421748483 is a prime.

It is not a weakly prime, because it can be changed into another prime (6421748471) 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, 3210874245 + 3210874246.

It is an arithmetic number, because the mean of its divisors is an integer number (3210874246).

Almost surely, 2^6421748491 is an apocalyptic number.

6421748491 is a deficient number, since it is larger than the sum of its proper divisors (1).

6421748491 is an equidigital number, since it uses as much as digits as its factorization.

6421748491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 46.

The square root of 6421748491 is about 80135.8127867934. The cubic root of 6421748491 is about 1858.7362297294.

The spelling of 6421748491 in words is "six billion, four hundred twenty-one million, seven hundred forty-eight thousand, four hundred ninety-one".