45645309 has 16 divisors (see below), whose sum is σ = 69451840. Its totient is φ = 29607120.

The previous prime is 45645293. The next prime is 45645311. The reversal of 45645309 is 90354654.

It is a happy number.

45645309 is a `hidden beast` number, since 4 + 5 + 645 + 3 + 0 + 9 = 666.

It is not a de Polignac number, because 45645309 - 2⁴ = 45645293 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 (45645329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21847 + ... + 23844.

It is an arithmetic number, because the mean of its divisors is an integer number (4340740).

Almost surely, 2^45645309 is an apocalyptic number.

It is an amenable number.

45645309 is a deficient number, since it is larger than the sum of its proper divisors (23806531).

45645309 is a wasteful number, since it uses less digits than its factorization.

45645309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45737 (or 45731 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 45645309 is about 6756.1312154220. The cubic root of 45645309 is about 357.3814861371.

It can be divided in two parts, 45645 and 309, that added together give a palindrome (45954).

The spelling of 45645309 in words is "forty-five million, six hundred forty-five thousand, three hundred nine".