445421057 has 2 divisors, whose sum is σ = 445421058. Its totient is φ = 445421056.

The previous prime is 445421023. The next prime is 445421069. The reversal of 445421057 is 750124544.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 261113281 + 184307776 = 16159^2 + 13576^2 .

It is a cyclic number.

It is not a de Polignac number, because 445421057 - 2¹⁸ = 445158913 is a prime.

It is not a weakly prime, because it can be changed into another prime (445421017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222710528 + 222710529.

It is an arithmetic number, because the mean of its divisors is an integer number (222710529).

Almost surely, 2^445421057 is an apocalyptic number.

It is an amenable number.

445421057 is a deficient number, since it is larger than the sum of its proper divisors (1).

445421057 is an equidigital number, since it uses as much as digits as its factorization.

445421057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22400, while the sum is 32.

The square root of 445421057 is about 21105.0007581142. Note that the first 3 decimals coincide. The cubic root of 445421057 is about 763.7013905952.

Subtracting from 445421057 its sum of digits (32), we obtain a square (445421025 = 21105²).

The spelling of 445421057 in words is "four hundred forty-five million, four hundred twenty-one thousand, fifty-seven".