144155989 has 4 divisors (see below), whose sum is σ = 144214924. Its totient is φ = 144097056.

The previous prime is 144155981. The next prime is 144156017. The reversal of 144155989 is 989551441.

It is a happy number.

144155989 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: 989551441 = 41 ⋅24135401.

It can be written as a sum of positive squares in 2 ways, for example, as 24581764 + 119574225 = 4958^2 + 10935^2 .

It is a cyclic number.

It is not a de Polignac number, because 144155989 - 2³ = 144155981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144155981) 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, 25632 + ... + 30745.

It is an arithmetic number, because the mean of its divisors is an integer number (36053731).

Almost surely, 2^144155989 is an apocalyptic number.

It is an amenable number.

144155989 is a deficient number, since it is larger than the sum of its proper divisors (58935).

144155989 is an equidigital number, since it uses as much as digits as its factorization.

144155989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58934.

The product of its digits is 259200, while the sum is 46.

The square root of 144155989 is about 12006.4977824510. The cubic root of 144155989 is about 524.3374729639.

The spelling of 144155989 in words is "one hundred forty-four million, one hundred fifty-five thousand, nine hundred eighty-nine".