1445055821 has 4 divisors (see below), whose sum is σ = 1576424544. Its totient is φ = 1313687100.

The previous prime is 1445055809. The next prime is 1445055841. The reversal of 1445055821 is 1285505441.

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 not a de Polignac number, because 1445055821 - 2¹⁴ = 1445039437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1445055841) 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, 65684345 + ... + 65684366.

It is an arithmetic number, because the mean of its divisors is an integer number (394106136).

Almost surely, 2^1445055821 is an apocalyptic number.

1445055821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1445055821 is a deficient number, since it is larger than the sum of its proper divisors (131368723).

1445055821 is a wasteful number, since it uses less digits than its factorization.

1445055821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131368722.

The product of its (nonzero) digits is 32000, while the sum is 35.

The square root of 1445055821 is about 38013.8898430561. The cubic root of 1445055821 is about 1130.5632770091.

The spelling of 1445055821 in words is "one billion, four hundred forty-five million, fifty-five thousand, eight hundred twenty-one".