445451681 has 4 divisors (see below), whose sum is σ = 445493952. Its totient is φ = 445409412.

The previous prime is 445451659. The next prime is 445451689. The reversal of 445451681 is 186154544.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-445451681 is a prime.

It is a super-2 number, since 2×445451681² = 396854400211451522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (445451689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8900 + ... + 31146.

It is an arithmetic number, because the mean of its divisors is an integer number (111373488).

Almost surely, 2^445451681 is an apocalyptic number.

It is an amenable number.

445451681 is a deficient number, since it is larger than the sum of its proper divisors (42271).

445451681 is a wasteful number, since it uses less digits than its factorization.

445451681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42270.

The product of its digits is 76800, while the sum is 38.

The square root of 445451681 is about 21105.7262608990. The cubic root of 445451681 is about 763.7188924286.

The spelling of 445451681 in words is "four hundred forty-five million, four hundred fifty-one thousand, six hundred eighty-one".