181470145 has 8 divisors (see below), whose sum is σ = 221873256. Its totient is φ = 142436736.

The previous prime is 181470143. The next prime is 181470167. The reversal of 181470145 is 541074181.

181470145 = T₂₃₈ + T₂₃₉ + ... + T₁₀₃₂.

It can be written as a sum of positive squares in 4 ways, for example, as 1481089 + 179989056 = 1217^2 + 13416^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 181470145 - 2¹ = 181470143 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181470143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 342132 + ... + 342661.

It is an arithmetic number, because the mean of its divisors is an integer number (27734157).

Almost surely, 2^181470145 is an apocalyptic number.

It is an amenable number.

181470145 is a deficient number, since it is larger than the sum of its proper divisors (40403111).

181470145 is an equidigital number, since it uses as much as digits as its factorization.

181470145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684851.

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 181470145 is about 13471.0855167652. The cubic root of 181470145 is about 566.1546283897.

The spelling of 181470145 in words is "one hundred eighty-one million, four hundred seventy thousand, one hundred forty-five".