144909581 has 8 divisors (see below), whose sum is σ = 154021824. Its totient is φ = 135862720.

The previous prime is 144909577. The next prime is 144909623. The reversal of 144909581 is 185909441.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 144909581 - 2² = 144909577 is a prime.

It is a super-2 number, since 2×144909581² = 41997573331191122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144909551) 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 7 ways as a sum of consecutive naturals, for example, 11735 + ... + 20676.

It is an arithmetic number, because the mean of its divisors is an integer number (19252728).

Almost surely, 2^144909581 is an apocalyptic number.

It is an amenable number.

144909581 is a deficient number, since it is larger than the sum of its proper divisors (9112243).

144909581 is a wasteful number, since it uses less digits than its factorization.

144909581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32691.

The product of its (nonzero) digits is 51840, while the sum is 41.

The square root of 144909581 is about 12037.8395486898. The cubic root of 144909581 is about 525.2495635862.

The spelling of 144909581 in words is "one hundred forty-four million, nine hundred nine thousand, five hundred eighty-one".