45501221 has 2 divisors, whose sum is σ = 45501222. Its totient is φ = 45501220.

The previous prime is 45501193. The next prime is 45501251. The reversal of 45501221 is 12210554.

45501221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36168196 + 9333025 = 6014^2 + 3055^2 .

It is a cyclic number.

It is not a de Polignac number, because 45501221 - 2²² = 41306917 is a prime.

It is a super-2 number, since 2×45501221² = 4140722224981682, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 45501193 and 45501202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45501251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22750610 + 22750611.

It is an arithmetic number, because the mean of its divisors is an integer number (22750611).

Almost surely, 2^45501221 is an apocalyptic number.

It is an amenable number.

45501221 is a deficient number, since it is larger than the sum of its proper divisors (1).

45501221 is an equidigital number, since it uses as much as digits as its factorization.

45501221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 45501221 is about 6745.4592875504. The cubic root of 45501221 is about 357.0050424687.

Adding to 45501221 its reverse (12210554), we get a palindrome (57711775).

The spelling of 45501221 in words is "forty-five million, five hundred one thousand, two hundred twenty-one".