445431213 has 12 divisors (see below), whose sum is σ = 665587260. Its totient is φ = 286714176.

The previous prime is 445431187. The next prime is 445431253. The reversal of 445431213 is 312134544.

It is a happy number.

445431213 is a `hidden beast` number, since 445 + 4 + 3 + 1 + 213 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 273637764 + 171793449 = 16542^2 + 13107^2 .

It is not a de Polignac number, because 445431213 - 2⁶ = 445431149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445431253) 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 11 ways as a sum of consecutive naturals, for example, 853056 + ... + 853577.

It is an arithmetic number, because the mean of its divisors is an integer number (55465605).

Almost surely, 2^445431213 is an apocalyptic number.

It is an amenable number.

445431213 is a deficient number, since it is larger than the sum of its proper divisors (220156047).

445431213 is a wasteful number, since it uses less digits than its factorization.

445431213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1706668 (or 1706665 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 445431213 is about 21105.2413632254. The cubic root of 445431213 is about 763.7071949102.

Adding to 445431213 its reverse (312134544), we get a palindrome (757565757).

The spelling of 445431213 in words is "four hundred forty-five million, four hundred thirty-one thousand, two hundred thirteen".