144445681 has 4 divisors (see below), whose sum is σ = 150725952. Its totient is φ = 138165412.

The previous prime is 144445673. The next prime is 144445699. The reversal of 144445681 is 186544441.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 186544441 = 4903 ⋅38047.

It is a cyclic number.

It is not a de Polignac number, because 144445681 - 2³ = 144445673 is a prime.

It is a super-2 number, since 2×144445681² = 41729109519107522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 144445681.

It is not an unprimeable number, because it can be changed into a prime (144442681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3140101 + ... + 3140146.

It is an arithmetic number, because the mean of its divisors is an integer number (37681488).

Almost surely, 2^144445681 is an apocalyptic number.

It is an amenable number.

144445681 is a deficient number, since it is larger than the sum of its proper divisors (6280271).

144445681 is an equidigital number, since it uses as much as digits as its factorization.

144445681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6280270.

The product of its digits is 61440, while the sum is 37.

The square root of 144445681 is about 12018.5556952572. Note that the first 3 decimals coincide. The cubic root of 144445681 is about 524.6884694476.

The spelling of 144445681 in words is "one hundred forty-four million, four hundred forty-five thousand, six hundred eighty-one".