449408681 has 4 divisors (see below), whose sum is σ = 450826692. Its totient is φ = 447990672.

The previous prime is 449408657. The next prime is 449408711. The reversal of 449408681 is 186804944.

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 173317225 + 276091456 = 13165^2 + 16616^2 .

It is a cyclic number.

It is not a de Polignac number, because 449408681 - 2¹⁰ = 449407657 is a prime.

It is a super-2 number, since 2×449408681² = 403936325116319522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (449468681) 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, 708530 + ... + 709163.

It is an arithmetic number, because the mean of its divisors is an integer number (112706673).

Almost surely, 2^449408681 is an apocalyptic number.

It is an amenable number.

449408681 is a deficient number, since it is larger than the sum of its proper divisors (1418011).

449408681 is a wasteful number, since it uses less digits than its factorization.

449408681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1418010.

The product of its (nonzero) digits is 221184, while the sum is 44.

The square root of 449408681 is about 21199.2613314710. The cubic root of 449408681 is about 765.9736309483.

The spelling of 449408681 in words is "four hundred forty-nine million, four hundred eight thousand, six hundred eighty-one".