144678181 has 4 divisors (see below), whose sum is σ = 147408012. Its totient is φ = 141948352.

The previous prime is 144678167. The next prime is 144678227. The reversal of 144678181 is 181876441.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 181876441 = 61 ⋅2981581.

It can be written as a sum of positive squares in 2 ways, for example, as 80838081 + 63840100 = 8991^2 + 7990^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-144678181 is a prime.

It is a super-2 number, since 2×144678181² = 41863552114937522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144672181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1364836 + ... + 1364941.

It is an arithmetic number, because the mean of its divisors is an integer number (36852003).

Almost surely, 2^144678181 is an apocalyptic number.

It is an amenable number.

144678181 is a deficient number, since it is larger than the sum of its proper divisors (2729831).

144678181 is an equidigital number, since it uses as much as digits as its factorization.

144678181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2729830.

The product of its digits is 43008, while the sum is 40.

The square root of 144678181 is about 12028.2243494208. The cubic root of 144678181 is about 524.9698316754.

The spelling of 144678181 in words is "one hundred forty-four million, six hundred seventy-eight thousand, one hundred eighty-one".