4449743621 has 2 divisors, whose sum is σ = 4449743622. Its totient is φ = 4449743620.

The previous prime is 4449743603. The next prime is 4449743629. The reversal of 4449743621 is 1263479444.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3637778596 + 811965025 = 60314^2 + 28495^2 .

It is a cyclic number.

It is not a de Polignac number, because 4449743621 - 2²⁶ = 4382634757 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4449743629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2224871810 + 2224871811.

It is an arithmetic number, because the mean of its divisors is an integer number (2224871811).

Almost surely, 2^4449743621 is an apocalyptic number.

It is an amenable number.

4449743621 is a deficient number, since it is larger than the sum of its proper divisors (1).

4449743621 is an equidigital number, since it uses as much as digits as its factorization.

4449743621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 44.

The square root of 4449743621 is about 66706.3986511039. The cubic root of 4449743621 is about 1644.7945680152.

The spelling of 4449743621 in words is "four billion, four hundred forty-nine million, seven hundred forty-three thousand, six hundred twenty-one".