447772813 has 2 divisors, whose sum is σ = 447772814. Its totient is φ = 447772812.

The previous prime is 447772781. The next prime is 447772817. The reversal of 447772813 is 318277744.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 235837449 + 211935364 = 15357^2 + 14558^2 .

It is a cyclic number.

It is not a de Polignac number, because 447772813 - 2⁵ = 447772781 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 447772813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (447772817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 223886406 + 223886407.

It is an arithmetic number, because the mean of its divisors is an integer number (223886407).

Almost surely, 2^447772813 is an apocalyptic number.

It is an amenable number.

447772813 is a deficient number, since it is larger than the sum of its proper divisors (1).

447772813 is an equidigital number, since it uses as much as digits as its factorization.

447772813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 263424, while the sum is 43.

The square root of 447772813 is about 21160.6430195304. The cubic root of 447772813 is about 765.0431080554.

The spelling of 447772813 in words is "four hundred forty-seven million, seven hundred seventy-two thousand, eight hundred thirteen".