444973981 has 2 divisors, whose sum is σ = 444973982. Its totient is φ = 444973980.

The previous prime is 444973973. The next prime is 444974029. The reversal of 444973981 is 189379444.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 347636025 + 97337956 = 18645^2 + 9866^2 .

It is a cyclic number.

It is not a de Polignac number, because 444973981 - 2³ = 444973973 is a prime.

It is a super-2 number, since 2×444973981² = 396003687533976722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (444973931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222486990 + 222486991.

It is an arithmetic number, because the mean of its divisors is an integer number (222486991).

Almost surely, 2^444973981 is an apocalyptic number.

It is an amenable number.

444973981 is a deficient number, since it is larger than the sum of its proper divisors (1).

444973981 is an equidigital number, since it uses as much as digits as its factorization.

444973981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 49.

The square root of 444973981 is about 21094.4063912688. The cubic root of 444973981 is about 763.4457920965.

The spelling of 444973981 in words is "four hundred forty-four million, nine hundred seventy-three thousand, nine hundred eighty-one".