181429145 has 4 divisors (see below), whose sum is σ = 217714980. Its totient is φ = 145143312.

The previous prime is 181429139. The next prime is 181429153. The reversal of 181429145 is 541924181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22391824 + 159037321 = 4732^2 + 12611^2 .

It is a cyclic number.

It is not a de Polignac number, because 181429145 - 2¹⁴ = 181412761 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18142910 + ... + 18142919.

It is an arithmetic number, because the mean of its divisors is an integer number (54428745).

Almost surely, 2^181429145 is an apocalyptic number.

It is an amenable number.

181429145 is a deficient number, since it is larger than the sum of its proper divisors (36285835).

181429145 is an equidigital number, since it uses as much as digits as its factorization.

181429145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36285834.

The product of its digits is 11520, while the sum is 35.

The square root of 181429145 is about 13469.5636529176. The cubic root of 181429145 is about 566.1119876050. Note that the first 3 decimals are identical.

The spelling of 181429145 in words is "one hundred eighty-one million, four hundred twenty-nine thousand, one hundred forty-five".