73145 has 4 divisors (see below), whose sum is σ = 87780. Its totient is φ = 58512.

The previous prime is 73141. The next prime is 73181. The reversal of 73145 is 54137.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54137 = 43 ⋅1259.

It can be written as a sum of positive squares in 2 ways, for example, as 19321 + 53824 = 139^2 + 232^2 .

It is a cyclic number.

It is not a de Polignac number, because 73145 - 2² = 73141 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (73141) 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, 7310 + ... + 7319.

It is an arithmetic number, because the mean of its divisors is an integer number (21945).

2⁷³¹⁴⁵ is an apocalyptic number.

It is an amenable number.

73145 is a deficient number, since it is larger than the sum of its proper divisors (14635).

73145 is a wasteful number, since it uses less digits than its factorization.

73145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14634.

The product of its digits is 420, while the sum is 20.

The square root of 73145 is about 270.4533231447. The cubic root of 73145 is about 41.8210450866.

It can be divided in two parts, 73 and 145, that multiplied together give a triangular number (10585 = T₁₄₅).

The spelling of 73145 in words is "seventy-three thousand, one hundred forty-five".