144415681 has 4 divisors (see below), whose sum is σ = 146394052. Its totient is φ = 142437312.

The previous prime is 144415651. The next prime is 144415709. The reversal of 144415681 is 186514441.

It is a happy number.

144415681 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: 186514441 = 7691 ⋅24251.

It can be written as a sum of positive squares in 2 ways, for example, as 60528400 + 83887281 = 7780^2 + 9159^2 .

It is a cyclic number.

It is not a de Polignac number, because 144415681 - 2⁷ = 144415553 is a prime.

It is a super-2 number, since 2×144415681² = 41711777837387522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (144415651) 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, 989076 + ... + 989221.

It is an arithmetic number, because the mean of its divisors is an integer number (36598513).

Almost surely, 2^144415681 is an apocalyptic number.

It is an amenable number.

144415681 is a deficient number, since it is larger than the sum of its proper divisors (1978371).

144415681 is an equidigital number, since it uses as much as digits as its factorization.

144415681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1978370.

The product of its digits is 15360, while the sum is 34.

The square root of 144415681 is about 12017.3075603481. The cubic root of 144415681 is about 524.6521426572.

The spelling of 144415681 in words is "one hundred forty-four million, four hundred fifteen thousand, six hundred eighty-one".