144691489 has 4 divisors (see below), whose sum is σ = 146124180. Its totient is φ = 143258800.

The previous prime is 144691453. The next prime is 144691529. The reversal of 144691489 is 984196441.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 984196441 = 28031 ⋅35111.

It can be written as a sum of positive squares in 2 ways, for example, as 115347600 + 29343889 = 10740^2 + 5417^2 .

It is a cyclic number.

It is not a de Polignac number, because 144691489 - 2⁹ = 144690977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (144691409) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 716194 + ... + 716395.

It is an arithmetic number, because the mean of its divisors is an integer number (36531045).

Almost surely, 2^144691489 is an apocalyptic number.

It is an amenable number.

144691489 is a deficient number, since it is larger than the sum of its proper divisors (1432691).

144691489 is a wasteful number, since it uses less digits than its factorization.

144691489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1432690.

The product of its digits is 248832, while the sum is 46.

The square root of 144691489 is about 12028.7775355603. Note that the first 3 decimals coincide. The cubic root of 144691489 is about 524.9859273628.

The spelling of 144691489 in words is "one hundred forty-four million, six hundred ninety-one thousand, four hundred eighty-nine".