181241645 has 8 divisors (see below), whose sum is σ = 234220056. Its totient is φ = 133839936.

The previous prime is 181241579. The next prime is 181241653. The reversal of 181241645 is 546142181.

It can be written as a sum of positive squares in 4 ways, for example, as 2244004 + 178997641 = 1498^2 + 13379^2 .

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 181241645 - 2¹⁶ = 181176109 is a prime.

It is a super-3 number, since 3×181241645³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1394102 + ... + 1394231.

It is an arithmetic number, because the mean of its divisors is an integer number (29277507).

Almost surely, 2^181241645 is an apocalyptic number.

It is an amenable number.

181241645 is a deficient number, since it is larger than the sum of its proper divisors (52978411).

181241645 is a wasteful number, since it uses less digits than its factorization.

181241645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2788351.

The product of its digits is 7680, while the sum is 32.

The square root of 181241645 is about 13462.6017173502. The cubic root of 181241645 is about 565.9169021083.

The spelling of 181241645 in words is "one hundred eighty-one million, two hundred forty-one thousand, six hundred forty-five".