449825891 has 2 divisors, whose sum is σ = 449825892. Its totient is φ = 449825890.

The previous prime is 449825869. The next prime is 449825941. The reversal of 449825891 is 198528944.

It is an a-pointer prime, because the next prime (449825941) can be obtained adding 449825891 to its sum of digits (50).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 449825891 - 2¹⁸ = 449563747 is a prime.

It is not a weakly prime, because it can be changed into another prime (449825851) 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, 224912945 + 224912946.

It is an arithmetic number, because the mean of its divisors is an integer number (224912946).

Almost surely, 2^449825891 is an apocalyptic number.

449825891 is a deficient number, since it is larger than the sum of its proper divisors (1).

449825891 is an equidigital number, since it uses as much as digits as its factorization.

449825891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 829440, while the sum is 50.

The square root of 449825891 is about 21209.0992500860. The cubic root of 449825891 is about 766.2105890010.

The spelling of 449825891 in words is "four hundred forty-nine million, eight hundred twenty-five thousand, eight hundred ninety-one".