447373385981 has 2 divisors, whose sum is σ = 447373385982. Its totient is φ = 447373385980.

The previous prime is 447373385971. The next prime is 447373386023. The reversal of 447373385981 is 189583373744.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 359322319225 + 88051066756 = 599435^2 + 296734^2 .

It is a cyclic number.

It is not a de Polignac number, because 447373385981 - 2¹⁰ = 447373384957 is a prime.

It is a super-2 number, since 2×447373385981² (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 (447373385951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 223686692990 + 223686692991.

It is an arithmetic number, because the mean of its divisors is an integer number (223686692991).

Almost surely, 2^447373385981 is an apocalyptic number.

It is an amenable number.

447373385981 is a deficient number, since it is larger than the sum of its proper divisors (1).

447373385981 is an equidigital number, since it uses as much as digits as its factorization.

447373385981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60963840, while the sum is 62.

The spelling of 447373385981 in words is "four hundred forty-seven billion, three hundred seventy-three million, three hundred eighty-five thousand, nine hundred eighty-one".