445231621 has 4 divisors (see below), whose sum is σ = 445312044. Its totient is φ = 445151200.

The previous prime is 445231613. The next prime is 445231637. The reversal of 445231621 is 126132544.

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 25391521 + 419840100 = 5039^2 + 20490^2 .

It is a cyclic number.

It is not a de Polignac number, because 445231621 - 2³ = 445231613 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 445231621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445231651) 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, 31240 + ... + 43201.

It is an arithmetic number, because the mean of its divisors is an integer number (111328011).

Almost surely, 2^445231621 is an apocalyptic number.

It is an amenable number.

445231621 is a deficient number, since it is larger than the sum of its proper divisors (80423).

445231621 is an equidigital number, since it uses as much as digits as its factorization.

445231621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80422.

The product of its digits is 5760, while the sum is 28.

The square root of 445231621 is about 21100.5123397514. The cubic root of 445231621 is about 763.5931087431.

The spelling of 445231621 in words is "four hundred forty-five million, two hundred thirty-one thousand, six hundred twenty-one".