181643345 has 16 divisors (see below), whose sum is σ = 237960912. Its totient is φ = 132295680.

The previous prime is 181643339. The next prime is 181643369. The reversal of 181643345 is 543346181.

It can be written as a sum of positive squares in 8 ways, for example, as 1117249 + 180526096 = 1057^2 + 13436^2 .

It is not a de Polignac number, because 181643345 - 2²⁶ = 114534481 is a prime.

It is a Duffinian 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 15 ways as a sum of consecutive naturals, for example, 14396 + ... + 23885.

It is an arithmetic number, because the mean of its divisors is an integer number (14872557).

Almost surely, 2^181643345 is an apocalyptic number.

It is an amenable number.

181643345 is a deficient number, since it is larger than the sum of its proper divisors (56317567).

181643345 is a wasteful number, since it uses less digits than its factorization.

181643345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38372.

The product of its digits is 34560, while the sum is 35.

The square root of 181643345 is about 13477.5125672358. The cubic root of 181643345 is about 566.3346888652.

The spelling of 181643345 in words is "one hundred eighty-one million, six hundred forty-three thousand, three hundred forty-five".