447787961 has 2 divisors, whose sum is σ = 447787962. Its totient is φ = 447787960.

The previous prime is 447787909. The next prime is 447787979. The reversal of 447787961 is 169787744.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 373069225 + 74718736 = 19315^2 + 8644^2 .

It is a cyclic number.

It is not a de Polignac number, because 447787961 - 2¹⁸ = 447525817 is a prime.

It is not a weakly prime, because it can be changed into another prime (447787981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 223893980 + 223893981.

It is an arithmetic number, because the mean of its divisors is an integer number (223893981).

Almost surely, 2^447787961 is an apocalyptic number.

It is an amenable number.

447787961 is a deficient number, since it is larger than the sum of its proper divisors (1).

447787961 is an equidigital number, since it uses as much as digits as its factorization.

447787961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2370816, while the sum is 53.

The square root of 447787961 is about 21161.0009451349. Note that the first 3 decimals coincide. The cubic root of 447787961 is about 765.0517350063.

The spelling of 447787961 in words is "four hundred forty-seven million, seven hundred eighty-seven thousand, nine hundred sixty-one".