445636981 has 2 divisors, whose sum is σ = 445636982. Its totient is φ = 445636980.

The previous prime is 445636951. The next prime is 445636999. The reversal of 445636981 is 189636544.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 405377956 + 40259025 = 20134^2 + 6345^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-445636981 is a prime.

It is a super-2 number, since 2×445636981² = 397184637669588722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (445636951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222818490 + 222818491.

It is an arithmetic number, because the mean of its divisors is an integer number (222818491).

Almost surely, 2^445636981 is an apocalyptic number.

It is an amenable number.

445636981 is a deficient number, since it is larger than the sum of its proper divisors (1).

445636981 is an equidigital number, since it uses as much as digits as its factorization.

445636981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 46.

The square root of 445636981 is about 21110.1156083997. The cubic root of 445636981 is about 763.8247755868.

The spelling of 445636981 in words is "four hundred forty-five million, six hundred thirty-six thousand, nine hundred eighty-one".