144993181 has 4 divisors (see below), whose sum is σ = 145456732. Its totient is φ = 144529632.

The previous prime is 144993151. The next prime is 144993253. The reversal of 144993181 is 181399441.

144993181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 181399441 = 19 ⋅9547339.

It can be written as a sum of positive squares in 2 ways, for example, as 54096025 + 90897156 = 7355^2 + 9534^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-144993181 is a prime.

It is a super-2 number, since 2×144993181² = 42046045072997522, 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 (144993131) 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, 231306 + ... + 231931.

It is an arithmetic number, because the mean of its divisors is an integer number (36364183).

Almost surely, 2^144993181 is an apocalyptic number.

It is an amenable number.

144993181 is a deficient number, since it is larger than the sum of its proper divisors (463551).

144993181 is an equidigital number, since it uses as much as digits as its factorization.

144993181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463550.

The product of its digits is 31104, while the sum is 40.

The square root of 144993181 is about 12041.3114318998. The cubic root of 144993181 is about 525.3505516683.

The spelling of 144993181 in words is "one hundred forty-four million, nine hundred ninety-three thousand, one hundred eighty-one".