445856881 has 4 divisors (see below), whose sum is σ = 446314212. Its totient is φ = 445399552.

The previous prime is 445856867. The next prime is 445856891. The reversal of 445856881 is 188658544.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 243079281 + 202777600 = 15591^2 + 14240^2 .

It is a cyclic number.

It is not a de Polignac number, because 445856881 - 2¹¹ = 445854833 is a prime.

It is a super-2 number, since 2×445856881² = 397576716670096322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (445856861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 227200 + ... + 229153.

It is an arithmetic number, because the mean of its divisors is an integer number (111578553).

Almost surely, 2^445856881 is an apocalyptic number.

It is an amenable number.

445856881 is a deficient number, since it is larger than the sum of its proper divisors (457331).

445856881 is an equidigital number, since it uses as much as digits as its factorization.

445856881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457330.

The product of its digits is 1228800, while the sum is 49.

The square root of 445856881 is about 21115.3233695343. The cubic root of 445856881 is about 763.9503916191.

The spelling of 445856881 in words is "four hundred forty-five million, eight hundred fifty-six thousand, eight hundred eighty-one".