45640321 has 2 divisors, whose sum is σ = 45640322. Its totient is φ = 45640320.

The previous prime is 45640313. The next prime is 45640379. The reversal of 45640321 is 12304654.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40640625 + 4999696 = 6375^2 + 2236^2 .

It is a cyclic number.

It is not a de Polignac number, because 45640321 - 2³ = 45640313 is a prime.

It is not a weakly prime, because it can be changed into another prime (45644321) 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 as a sum of consecutive naturals, namely, 22820160 + 22820161.

It is an arithmetic number, because the mean of its divisors is an integer number (22820161).

Almost surely, 2^45640321 is an apocalyptic number.

It is an amenable number.

45640321 is a deficient number, since it is larger than the sum of its proper divisors (1).

45640321 is an equidigital number, since it uses as much as digits as its factorization.

45640321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 45640321 is about 6755.7620591611. The cubic root of 45640321 is about 357.3684677581.

Adding to 45640321 its reverse (12304654), we get a palindrome (57944975).

The spelling of 45640321 in words is "forty-five million, six hundred forty thousand, three hundred twenty-one".