45516221 has 2 divisors, whose sum is σ = 45516222. Its totient is φ = 45516220.

The previous prime is 45516217. The next prime is 45516271. The reversal of 45516221 is 12261554.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30415225 + 15100996 = 5515^2 + 3886^2 .

It is a cyclic number.

It is not a de Polignac number, because 45516221 - 2² = 45516217 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p_2747600 and since 45516221 and 2747600 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45516271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22758110 + 22758111.

It is an arithmetic number, because the mean of its divisors is an integer number (22758111).

Almost surely, 2^45516221 is an apocalyptic number.

It is an amenable number.

45516221 is a deficient number, since it is larger than the sum of its proper divisors (1).

45516221 is an equidigital number, since it uses as much as digits as its factorization.

45516221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2400, while the sum is 26.

The square root of 45516221 is about 6746.5710549879. The cubic root of 45516221 is about 357.0442684292.

Adding to 45516221 its reverse (12261554), we get a palindrome (57777775).

The spelling of 45516221 in words is "forty-five million, five hundred sixteen thousand, two hundred twenty-one".