145181 has 4 divisors (see below), whose sum is σ = 148764. Its totient is φ = 141600.

The previous prime is 145177. The next prime is 145193. The reversal of 145181 is 181541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 181541 = 379 ⋅479.

It can be written as a sum of positive squares in 2 ways, for example, as 28900 + 116281 = 170^2 + 341^2 .

It is a cyclic number.

It is not a de Polignac number, because 145181 - 2² = 145177 is a prime.

It is a super-2 number, since 2×145181² = 42155045522, which contains 22 as substring.

It is a deceptive number, since it divides R₁₄₅₁₈₀.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 145181.

It is not an unprimeable number, because it can be changed into a prime (145121) 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, 1730 + ... + 1811.

It is an arithmetic number, because the mean of its divisors is an integer number (37191).

2¹⁴⁵¹⁸¹ is an apocalyptic number.

It is an amenable number.

145181 is a deficient number, since it is larger than the sum of its proper divisors (3583).

145181 is an equidigital number, since it uses as much as digits as its factorization.

145181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3582.

The product of its digits is 160, while the sum is 20.

The square root of 145181 is about 381.0262458152. The cubic root of 145181 is about 52.5577293920.

Subtracting from 145181 its sum of digits (20), we obtain a square (145161 = 381²).

The spelling of 145181 in words is "one hundred forty-five thousand, one hundred eighty-one".