181648145 has 24 divisors (see below), whose sum is σ = 268487784. Its totient is φ = 117229056.

The previous prime is 181648139. The next prime is 181648147. The reversal of 181648145 is 541846181.

It can be written as a sum of positive squares in 4 ways, for example, as 58859584 + 122788561 = 7672^2 + 11081^2 .

It is not a de Polignac number, because 181648145 - 2¹⁰ = 181647121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 181648099 and 181648108.

It is not an unprimeable number, because it can be changed into a prime (181648147) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17642 + ... + 25971.

It is an arithmetic number, because the mean of its divisors is an integer number (11186991).

Almost surely, 2^181648145 is an apocalyptic number.

It is an amenable number.

181648145 is a deficient number, since it is larger than the sum of its proper divisors (86839639).

181648145 is a wasteful number, since it uses less digits than its factorization.

181648145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43649 (or 43642 counting only the distinct ones).

The product of its digits is 30720, while the sum is 38.

The square root of 181648145 is about 13477.6906404621. The cubic root of 181648145 is about 566.3396773635.

The spelling of 181648145 in words is "one hundred eighty-one million, six hundred forty-eight thousand, one hundred forty-five".