181510045 has 4 divisors (see below), whose sum is σ = 217812060. Its totient is φ = 145208032.

The previous prime is 181510039. The next prime is 181510061. The reversal of 181510045 is 540015181.

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: 540015181 = 83 ⋅6506207.

It can be written as a sum of positive squares in 2 ways, for example, as 55666521 + 125843524 = 7461^2 + 11218^2 .

It is a cyclic number.

It is not a de Polignac number, because 181510045 - 2⁵ = 181510013 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18151000 + ... + 18151009.

It is an arithmetic number, because the mean of its divisors is an integer number (54453015).

Almost surely, 2^181510045 is an apocalyptic number.

It is an amenable number.

181510045 is a deficient number, since it is larger than the sum of its proper divisors (36302015).

181510045 is an equidigital number, since it uses as much as digits as its factorization.

181510045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36302014.

The product of its (nonzero) digits is 800, while the sum is 25.

The square root of 181510045 is about 13472.5663850656. The cubic root of 181510045 is about 566.1961189873.

The spelling of 181510045 in words is "one hundred eighty-one million, five hundred ten thousand, forty-five".