442645213 has 2 divisors, whose sum is σ = 442645214. Its totient is φ = 442645212.

The previous prime is 442645211. The next prime is 442645271. The reversal of 442645213 is 312546244.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 385219129 + 57426084 = 19627^2 + 7578^2 .

It is a cyclic number.

It is not a de Polignac number, because 442645213 - 2¹ = 442645211 is a prime.

Together with 442645211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442645211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221322606 + 221322607.

It is an arithmetic number, because the mean of its divisors is an integer number (221322607).

Almost surely, 2^442645213 is an apocalyptic number.

It is an amenable number.

442645213 is a deficient number, since it is larger than the sum of its proper divisors (1).

442645213 is an equidigital number, since it uses as much as digits as its factorization.

442645213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 31.

The square root of 442645213 is about 21039.1352721541. The cubic root of 442645213 is about 762.1116326647. Note that the first 3 decimals are identical.

The spelling of 442645213 in words is "four hundred forty-two million, six hundred forty-five thousand, two hundred thirteen".