442621253 has 2 divisors, whose sum is σ = 442621254. Its totient is φ = 442621252.

The previous prime is 442621243. The next prime is 442621271. The reversal of 442621253 is 352126244.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 231587524 + 211033729 = 15218^2 + 14527^2 .

It is a cyclic number.

It is not a de Polignac number, because 442621253 - 2⁶ = 442621189 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442621213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221310626 + 221310627.

It is an arithmetic number, because the mean of its divisors is an integer number (221310627).

Almost surely, 2^442621253 is an apocalyptic number.

It is an amenable number.

442621253 is a deficient number, since it is larger than the sum of its proper divisors (1).

442621253 is an equidigital number, since it uses as much as digits as its factorization.

442621253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 29.

The square root of 442621253 is about 21038.5658494109. The cubic root of 442621253 is about 762.0978816035.

Adding to 442621253 its reverse (352126244), we get a palindrome (794747497).

The spelling of 442621253 in words is "four hundred forty-two million, six hundred twenty-one thousand, two hundred fifty-three".