144002081 has 4 divisors (see below), whose sum is σ = 148967700. Its totient is φ = 139036464.

The previous prime is 144002021. The next prime is 144002101. The reversal of 144002081 is 180200441.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 180200441 = 863 ⋅208807.

It can be written as a sum of positive squares in 2 ways, for example, as 42315025 + 101687056 = 6505^2 + 10084^2 .

It is a cyclic number.

It is not a de Polignac number, because 144002081 - 2⁶ = 144002017 is a prime.

It is a super-2 number, since 2×144002081² = 41473198664661122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (144002021) 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, 2482766 + ... + 2482823.

It is an arithmetic number, because the mean of its divisors is an integer number (37241925).

Almost surely, 2^144002081 is an apocalyptic number.

It is an amenable number.

144002081 is a deficient number, since it is larger than the sum of its proper divisors (4965619).

144002081 is an equidigital number, since it uses as much as digits as its factorization.

144002081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4965618.

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 144002081 is about 12000.0867080201. The cubic root of 144002081 is about 524.1508037198.

The spelling of 144002081 in words is "one hundred forty-four million, two thousand, eighty-one".