1453545221 has 4 divisors (see below), whose sum is σ = 1503667500. Its totient is φ = 1403422944.

The previous prime is 1453545217. The next prime is 1453545227. The reversal of 1453545221 is 1225453541.

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 1140750625 + 312794596 = 33775^2 + 17686^2 .

It is a cyclic number.

It is not a de Polignac number, because 1453545221 - 2² = 1453545217 is a prime.

It is a super-2 number, since 2×1453545221² = 4225587418983877682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1453545227) 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, 25061096 + ... + 25061153.

It is an arithmetic number, because the mean of its divisors is an integer number (375916875).

Almost surely, 2^1453545221 is an apocalyptic number.

It is an amenable number.

1453545221 is a deficient number, since it is larger than the sum of its proper divisors (50122279).

1453545221 is an equidigital number, since it uses as much as digits as its factorization.

1453545221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50122278.

The product of its digits is 24000, while the sum is 32.

The square root of 1453545221 is about 38125.3881422865. The cubic root of 1453545221 is about 1132.7728963699.

Adding to 1453545221 its reverse (1225453541), we get a palindrome (2678998762).

The spelling of 1453545221 in words is "one billion, four hundred fifty-three million, five hundred forty-five thousand, two hundred twenty-one".