422721449 has 2 divisors, whose sum is σ = 422721450. Its totient is φ = 422721448.

The previous prime is 422721437. The next prime is 422721499. The reversal of 422721449 is 944127224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 351825049 + 70896400 = 18757^2 + 8420^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-422721449 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (422721419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211360724 + 211360725.

It is an arithmetic number, because the mean of its divisors is an integer number (211360725).

Almost surely, 2^422721449 is an apocalyptic number.

It is an amenable number.

422721449 is a deficient number, since it is larger than the sum of its proper divisors (1).

422721449 is an equidigital number, since it uses as much as digits as its factorization.

422721449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 35.

The square root of 422721449 is about 20560.1908794641. The cubic root of 422721449 is about 750.5012643116.

The spelling of 422721449 in words is "four hundred twenty-two million, seven hundred twenty-one thousand, four hundred forty-nine".