45645209 has 2 divisors, whose sum is σ = 45645210. Its totient is φ = 45645208.

The previous prime is 45645191. The next prime is 45645211. The reversal of 45645209 is 90254654.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34105600 + 11539609 = 5840^2 + 3397^2 .

It is a cyclic number.

It is not a de Polignac number, because 45645209 - 2⁸ = 45644953 is a prime.

It is a super-3 number, since 3×45645209³ (a number of 24 digits) contains 333 as substring.

Together with 45645211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (45645109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22822604 + 22822605.

It is an arithmetic number, because the mean of its divisors is an integer number (22822605).

Almost surely, 2^45645209 is an apocalyptic number.

It is an amenable number.

45645209 is a deficient number, since it is larger than the sum of its proper divisors (1).

45645209 is an equidigital number, since it uses as much as digits as its factorization.

45645209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 45645209 is about 6756.1238147328. The cubic root of 45645209 is about 357.3812251524.

It can be divided in two parts, 45645 and 209, that added together give a palindrome (45854).

The spelling of 45645209 in words is "forty-five million, six hundred forty-five thousand, two hundred nine".