445505221 has 16 divisors (see below), whose sum is σ = 539562240. Its totient is φ = 359694720.

The previous prime is 445505209. The next prime is 445505251. The reversal of 445505221 is 122505544.

It is not a de Polignac number, because 445505221 - 2¹³ = 445497029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 445505221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445505201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18441 + ... + 35086.

It is an arithmetic number, because the mean of its divisors is an integer number (33722640).

Almost surely, 2^445505221 is an apocalyptic number.

445505221 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

445505221 is a deficient number, since it is larger than the sum of its proper divisors (94057019).

445505221 is a wasteful number, since it uses less digits than its factorization.

445505221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53604.

The product of its (nonzero) digits is 8000, while the sum is 28.

The square root of 445505221 is about 21106.9945989475. The cubic root of 445505221 is about 763.7494889917.

The spelling of 445505221 in words is "four hundred forty-five million, five hundred five thousand, two hundred twenty-one".