45145509 has 4 divisors (see below), whose sum is σ = 60194016. Its totient is φ = 30097004.

The previous prime is 45145493. The next prime is 45145537. The reversal of 45145509 is 90554154.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 45145509 - 2⁴ = 45145493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 45145509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (45145549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7524249 + ... + 7524254.

It is an arithmetic number, because the mean of its divisors is an integer number (15048504).

Almost surely, 2^45145509 is an apocalyptic number.

It is an amenable number.

45145509 is a deficient number, since it is larger than the sum of its proper divisors (15048507).

45145509 is a wasteful number, since it uses less digits than its factorization.

45145509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15048506.

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 45145509 is about 6719.0407797542. The cubic root of 45145509 is about 356.0722957369.

It can be divided in two parts, 45145 and 509, that added together give a palindrome (45654).

The spelling of 45145509 in words is "forty-five million, one hundred forty-five thousand, five hundred nine".