447787861 has 2 divisors, whose sum is σ = 447787862. Its totient is φ = 447787860.

The previous prime is 447787859. The next prime is 447787889. The reversal of 447787861 is 168787744.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 335109636 + 112678225 = 18306^2 + 10615^2 .

It is a cyclic number.

It is not a de Polignac number, because 447787861 - 2¹ = 447787859 is a prime.

Together with 447787859, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 447787799 and 447787808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (447787961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 223893930 + 223893931.

It is an arithmetic number, because the mean of its divisors is an integer number (223893931).

Almost surely, 2^447787861 is an apocalyptic number.

It is an amenable number.

447787861 is a deficient number, since it is larger than the sum of its proper divisors (1).

447787861 is an equidigital number, since it uses as much as digits as its factorization.

447787861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2107392, while the sum is 52.

The square root of 447787861 is about 21160.9985822976. The cubic root of 447787861 is about 765.0516780559.

The spelling of 447787861 in words is "four hundred forty-seven million, seven hundred eighty-seven thousand, eight hundred sixty-one".