448643491 has 2 divisors, whose sum is σ = 448643492. Its totient is φ = 448643490.

The previous prime is 448643483. The next prime is 448643557. The reversal of 448643491 is 194346844.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 448643491 - 2³ = 448643483 is a prime.

It is not a weakly prime, because it can be changed into another prime (448643401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 224321745 + 224321746.

It is an arithmetic number, because the mean of its divisors is an integer number (224321746).

Almost surely, 2^448643491 is an apocalyptic number.

448643491 is a deficient number, since it is larger than the sum of its proper divisors (1).

448643491 is an equidigital number, since it uses as much as digits as its factorization.

448643491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 331776, while the sum is 43.

The square root of 448643491 is about 21181.2060799191. The cubic root of 448643491 is about 765.5386531993.

The spelling of 448643491 in words is "four hundred forty-eight million, six hundred forty-three thousand, four hundred ninety-one".