442444208981 has 2 divisors, whose sum is σ = 442444208982. Its totient is φ = 442444208980.

The previous prime is 442444208977. The next prime is 442444208989. The reversal of 442444208981 is 189802444244.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 234991288081 + 207452920900 = 484759^2 + 455470^2 .

It is a cyclic number.

It is not a de Polignac number, because 442444208981 - 2² = 442444208977 is a prime.

It is a super-2 number, since 2×442444208981² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442444208989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221222104490 + 221222104491.

It is an arithmetic number, because the mean of its divisors is an integer number (221222104491).

Almost surely, 2^442444208981 is an apocalyptic number.

It is an amenable number.

442444208981 is a deficient number, since it is larger than the sum of its proper divisors (1).

442444208981 is an equidigital number, since it uses as much as digits as its factorization.

442444208981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2359296, while the sum is 50.

The spelling of 442444208981 in words is "four hundred forty-two billion, four hundred forty-four million, two hundred eight thousand, nine hundred eighty-one".