442255981 has 2 divisors, whose sum is σ = 442255982. Its totient is φ = 442255980.

The previous prime is 442255963. The next prime is 442255991. The reversal of 442255981 is 189552244.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 366722500 + 75533481 = 19150^2 + 8691^2 .

It is a cyclic number.

It is not a de Polignac number, because 442255981 - 2⁵ = 442255949 is a prime.

It is a super-2 number, since 2×442255981² = 391180705460544722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442255991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221127990 + 221127991.

It is an arithmetic number, because the mean of its divisors is an integer number (221127991).

Almost surely, 2^442255981 is an apocalyptic number.

It is an amenable number.

442255981 is a deficient number, since it is larger than the sum of its proper divisors (1).

442255981 is an equidigital number, since it uses as much as digits as its factorization.

442255981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 115200, while the sum is 40.

The square root of 442255981 is about 21029.8830477014. The cubic root of 442255981 is about 761.8881841657. Note that the first 3 decimals are identical.

The spelling of 442255981 in words is "four hundred forty-two million, two hundred fifty-five thousand, nine hundred eighty-one".