4449622581 has 6 divisors (see below), whose sum is σ = 6427232630. Its totient is φ = 2966415048.

The previous prime is 4449622561. The next prime is 4449622609. The reversal of 4449622581 is 1852269444.

It is a happy number.

4449622581 is a `hidden beast` number, since 4 + 4 + 4 + 9 + 62 + 2 + 581 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4444355556 + 5267025 = 66666^2 + 2295^2 .

It is not a de Polignac number, because 4449622581 - 2¹⁰ = 4449621557 is a prime.

It is a super-2 number, since 2×4449622581² = 39598282226690203122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4449622531) 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 in 5 ways as a sum of consecutive naturals, for example, 247201246 + ... + 247201263.

Almost surely, 2^4449622581 is an apocalyptic number.

It is an amenable number.

4449622581 is a deficient number, since it is larger than the sum of its proper divisors (1977610049).

4449622581 is a wasteful number, since it uses less digits than its factorization.

4449622581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494402515 (or 494402512 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The square root of 4449622581 is about 66705.4913856423. The cubic root of 4449622581 is about 1644.7796542167.

The spelling of 4449622581 in words is "four billion, four hundred forty-nine million, six hundred twenty-two thousand, five hundred eighty-one".