442065521 has 2 divisors, whose sum is σ = 442065522. Its totient is φ = 442065520.

The previous prime is 442065509. The next prime is 442065551. The reversal of 442065521 is 125560244.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 418407025 + 23658496 = 20455^2 + 4864^2 .

It is a cyclic number.

It is not a de Polignac number, because 442065521 - 2¹⁴ = 442049137 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (442065551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221032760 + 221032761.

It is an arithmetic number, because the mean of its divisors is an integer number (221032761).

Almost surely, 2^442065521 is an apocalyptic number.

It is an amenable number.

442065521 is a deficient number, since it is larger than the sum of its proper divisors (1).

442065521 is an equidigital number, since it uses as much as digits as its factorization.

442065521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 442065521 is about 21025.3542419623. The cubic root of 442065521 is about 761.7787979991.

The spelling of 442065521 in words is "four hundred forty-two million, sixty-five thousand, five hundred twenty-one".