45221209 has 12 divisors (see below), whose sum is σ = 49871808. Its totient is φ = 40973240.

The previous prime is 45221201. The next prime is 45221213. The reversal of 45221209 is 90212254.

It is not a de Polignac number, because 45221209 - 2³ = 45221201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45221201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60492 + ... + 61234.

It is an arithmetic number, because the mean of its divisors is an integer number (4155984).

Almost surely, 2^45221209 is an apocalyptic number.

It is an amenable number.

45221209 is a deficient number, since it is larger than the sum of its proper divisors (4650599).

45221209 is a wasteful number, since it uses less digits than its factorization.

45221209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1268 (or 1257 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 45221209 is about 6724.6716648473. The cubic root of 45221209 is about 356.2712053039.

The spelling of 45221209 in words is "forty-five million, two hundred twenty-one thousand, two hundred nine".