45138509 has 8 divisors (see below), whose sum is σ = 51169440. Its totient is φ = 39473136.

The previous prime is 45138497. The next prime is 45138551. The reversal of 45138509 is 90583154.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 45138509 - 2⁴ = 45138493 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 (45138559) 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 in 7 ways as a sum of consecutive naturals, for example, 91127 + ... + 91620.

It is an arithmetic number, because the mean of its divisors is an integer number (6396180).

Almost surely, 2^45138509 is an apocalyptic number.

It is an amenable number.

45138509 is a deficient number, since it is larger than the sum of its proper divisors (6030931).

45138509 is a wasteful number, since it uses less digits than its factorization.

45138509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182779.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 45138509 is about 6718.5198518721. The cubic root of 45138509 is about 356.0538912860.

The spelling of 45138509 in words is "forty-five million, one hundred thirty-eight thousand, five hundred nine".