441621409 has 4 divisors (see below), whose sum is σ = 441868420. Its totient is φ = 441374400.

The previous prime is 441621361. The next prime is 441621451. The reversal of 441621409 is 904126144.

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 122213025 + 319408384 = 11055^2 + 17872^2 .

It is a cyclic number.

It is not a de Polignac number, because 441621409 - 2⁹ = 441620897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (441621109) 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, 120804 + ... + 124405.

It is an arithmetic number, because the mean of its divisors is an integer number (110467105).

Almost surely, 2^441621409 is an apocalyptic number.

It is an amenable number.

441621409 is a deficient number, since it is larger than the sum of its proper divisors (247011).

441621409 is a wasteful number, since it uses less digits than its factorization.

441621409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247010.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 441621409 is about 21014.7902440162. The cubic root of 441621409 is about 761.5236107425.

The spelling of 441621409 in words is "four hundred forty-one million, six hundred twenty-one thousand, four hundred nine".