4409331721 has 2 divisors, whose sum is σ = 4409331722. Its totient is φ = 4409331720.

The previous prime is 4409331697. The next prime is 4409331799. The reversal of 4409331721 is 1271339044.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2424183696 + 1985148025 = 49236^2 + 44555^2 .

It is a cyclic number.

It is not a de Polignac number, because 4409331721 - 2⁹ = 4409331209 is a prime.

It is not a weakly prime, because it can be changed into another prime (4409337721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2204665860 + 2204665861.

It is an arithmetic number, because the mean of its divisors is an integer number (2204665861).

Almost surely, 2^4409331721 is an apocalyptic number.

It is an amenable number.

4409331721 is a deficient number, since it is larger than the sum of its proper divisors (1).

4409331721 is an equidigital number, since it uses as much as digits as its factorization.

4409331721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 4409331721 is about 66402.7990449198. The cubic root of 4409331721 is about 1639.8001591961.

The spelling of 4409331721 in words is "four billion, four hundred nine million, three hundred thirty-one thousand, seven hundred twenty-one".