144664217 has 4 divisors (see below), whose sum is σ = 145768656. Its totient is φ = 143559780.

The previous prime is 144664213. The next prime is 144664229. The reversal of 144664217 is 712466441.

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: 712466441 = 43 ⋅16568987.

It is a cyclic number.

It is not a de Polignac number, because 144664217 - 2² = 144664213 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (144664213) 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, 552023 + ... + 552284.

It is an arithmetic number, because the mean of its divisors is an integer number (36442164).

Almost surely, 2^144664217 is an apocalyptic number.

It is an amenable number.

144664217 is a deficient number, since it is larger than the sum of its proper divisors (1104439).

144664217 is a wasteful number, since it uses less digits than its factorization.

144664217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104438.

The product of its digits is 32256, while the sum is 35.

The square root of 144664217 is about 12027.6438673582. The cubic root of 144664217 is about 524.9529415114.

The spelling of 144664217 in words is "one hundred forty-four million, six hundred sixty-four thousand, two hundred seventeen".