45551221 has 8 divisors (see below), whose sum is σ = 46513440. Its totient is φ = 44592912.

The previous prime is 45551173. The next prime is 45551239. The reversal of 45551221 is 12215554.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 45551221 - 2¹¹ = 45549173 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 (45551251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38586 + ... + 39748.

It is an arithmetic number, because the mean of its divisors is an integer number (5814180).

Almost surely, 2^45551221 is an apocalyptic number.

It is an amenable number.

45551221 is a deficient number, since it is larger than the sum of its proper divisors (962219).

45551221 is a wasteful number, since it uses less digits than its factorization.

45551221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1955.

The product of its digits is 2000, while the sum is 25.

The square root of 45551221 is about 6749.1644668062. The cubic root of 45551221 is about 357.1357621676.

Adding to 45551221 its reverse (12215554), we get a palindrome (57766775).

It can be divided in two parts, 4555 and 1221, that multiplied together give a palindrome (5561655).

The spelling of 45551221 in words is "forty-five million, five hundred fifty-one thousand, two hundred twenty-one".