45145 has 4 divisors (see below), whose sum is σ = 54180. Its totient is φ = 36112.

The previous prime is 45139. The next prime is 45161. The reversal of 45145 is 54154.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54154 = 2 ⋅27077.

It can be written as a sum of positive squares in 2 ways, for example, as 35344 + 9801 = 188^2 + 99^2 .

It is a cyclic number.

It is not a de Polignac number, because 45145 - 2³ = 45137 is a prime.

45145 is a lucky number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4510 + ... + 4519.

It is an arithmetic number, because the mean of its divisors is an integer number (13545).

2⁴⁵¹⁴⁵ is an apocalyptic number.

It is an amenable number.

45145 is a deficient number, since it is larger than the sum of its proper divisors (9035).

45145 is an equidigital number, since it uses as much as digits as its factorization.

45145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9034.

The product of its digits is 400, while the sum is 19.

The square root of 45145 is about 212.4735277629. The cubic root of 45145 is about 35.6070957535.

Adding to 45145 its reverse (54154), we get a palindrome (99299).

Subtracting 45145 from its reverse (54154), we obtain a palindrome (9009).

It can be divided in two parts, 451 and 45, that added together give a triangular number (496 = T₃₁).

The spelling of 45145 in words is "forty-five thousand, one hundred forty-five".