445405221 has 12 divisors (see below), whose sum is σ = 648060972. Its totient is φ = 294768576.

The previous prime is 445405211. The next prime is 445405231. The reversal of 445405221 is 122504544.

It is an interprime number because it is at equal distance from previous prime (445405211) and next prime (445405231).

It can be written as a sum of positive squares in 2 ways, for example, as 390497121 + 54908100 = 19761^2 + 7410^2 .

It is a de Polignac number, because none of the positive numbers 2^k-445405221 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445405211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 179386 + ... + 181851.

It is an arithmetic number, because the mean of its divisors is an integer number (54005081).

Almost surely, 2^445405221 is an apocalyptic number.

It is an amenable number.

445405221 is a deficient number, since it is larger than the sum of its proper divisors (202655751).

445405221 is a wasteful number, since it uses less digits than its factorization.

445405221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361380 (or 361377 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

The square root of 445405221 is about 21104.6255830327. The cubic root of 445405221 is about 763.6923398941.

Adding to 445405221 its reverse (122504544), we get a palindrome (567909765).

The spelling of 445405221 in words is "four hundred forty-five million, four hundred five thousand, two hundred twenty-one".