449257813 has 2 divisors, whose sum is σ = 449257814. Its totient is φ = 449257812.

The previous prime is 449257799. The next prime is 449257817. The reversal of 449257813 is 318752944.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 255296484 + 193961329 = 15978^2 + 13927^2 .

It is a cyclic number.

It is not a de Polignac number, because 449257813 - 2²¹ = 447160661 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 449257813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (449257817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 224628906 + 224628907.

It is an arithmetic number, because the mean of its divisors is an integer number (224628907).

Almost surely, 2^449257813 is an apocalyptic number.

It is an amenable number.

449257813 is a deficient number, since it is larger than the sum of its proper divisors (1).

449257813 is an equidigital number, since it uses as much as digits as its factorization.

449257813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 43.

The square root of 449257813 is about 21195.7027012553. The cubic root of 449257813 is about 765.8879080503.

The spelling of 449257813 in words is "four hundred forty-nine million, two hundred fifty-seven thousand, eight hundred thirteen".