445540921 has 4 divisors (see below), whose sum is σ = 509189632. Its totient is φ = 381892212.

The previous prime is 445540873. The next prime is 445540933. The reversal of 445540921 is 129045544.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-445540921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (445540621) 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, 31824345 + ... + 31824358.

It is an arithmetic number, because the mean of its divisors is an integer number (127297408).

Almost surely, 2^445540921 is an apocalyptic number.

It is an amenable number.

445540921 is a deficient number, since it is larger than the sum of its proper divisors (63648711).

445540921 is an equidigital number, since it uses as much as digits as its factorization.

445540921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63648710.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 445540921 is about 21107.8402732255. The cubic root of 445540921 is about 763.7698891481.

The spelling of 445540921 in words is "four hundred forty-five million, five hundred forty thousand, nine hundred twenty-one".