45540509 has 16 divisors (see below), whose sum is σ = 53568000. Its totient is φ = 37906944.

The previous prime is 45540497. The next prime is 45540533. The reversal of 45540509 is 90504554.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 45540509 - 2⁴ = 45540493 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 (45540559) 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, 48557 + ... + 49485.

It is an arithmetic number, because the mean of its divisors is an integer number (3348000).

Almost surely, 2^45540509 is an apocalyptic number.

It is an amenable number.

45540509 is a deficient number, since it is larger than the sum of its proper divisors (8027491).

45540509 is a wasteful number, since it uses less digits than its factorization.

45540509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1132.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 45540509 is about 6748.3708404325. The cubic root of 45540509 is about 357.1077648339.

The spelling of 45540509 in words is "forty-five million, five hundred forty thousand, five hundred nine".