442440161 has 2 divisors, whose sum is σ = 442440162. Its totient is φ = 442440160.

The previous prime is 442440151. The next prime is 442440169. The reversal of 442440161 is 161044244.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 394221025 + 48219136 = 19855^2 + 6944^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-442440161 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 442440161.

It is not a weakly prime, because it can be changed into another prime (442440169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221220080 + 221220081.

It is an arithmetic number, because the mean of its divisors is an integer number (221220081).

Almost surely, 2^442440161 is an apocalyptic number.

It is an amenable number.

442440161 is a deficient number, since it is larger than the sum of its proper divisors (1).

442440161 is an equidigital number, since it uses as much as digits as its factorization.

442440161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 442440161 is about 21034.2615986395. The cubic root of 442440161 is about 761.9939336988.

The spelling of 442440161 in words is "four hundred forty-two million, four hundred forty thousand, one hundred sixty-one".