445135221 has 6 divisors (see below), whose sum is σ = 642973110. Its totient is φ = 296756808.

The previous prime is 445135177. The next prime is 445135253. The reversal of 445135221 is 122531544.

It can be written as a sum of positive squares in only one way, i.e., 436224996 + 8910225 = 20886^2 + 2985^2 .

It is not a de Polignac number, because 445135221 - 2¹⁰ = 445134197 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 (445135921) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24729726 + ... + 24729743.

It is an arithmetic number, because the mean of its divisors is an integer number (107162185).

Almost surely, 2^445135221 is an apocalyptic number.

It is an amenable number.

445135221 is a deficient number, since it is larger than the sum of its proper divisors (197837889).

445135221 is a wasteful number, since it uses less digits than its factorization.

445135221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49459475 (or 49459472 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 445135221 is about 21098.2279113673. The cubic root of 445135221 is about 763.5379945917.

Adding to 445135221 its reverse (122531544), we get a palindrome (567666765).

The spelling of 445135221 in words is "four hundred forty-five million, one hundred thirty-five thousand, two hundred twenty-one".