144564993 has 10 divisors (see below), whose sum is σ = 215955234. Its totient is φ = 96376608.

The previous prime is 144564983. The next prime is 144565007. The reversal of 144564993 is 399465441.

It can be written as a sum of positive squares in only one way, i.e., 112211649 + 32353344 = 10593^2 + 5688^2 .

It is not a de Polignac number, because 144564993 - 2⁵ = 144564961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (144564983) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 892296 + ... + 892457.

Almost surely, 2^144564993 is an apocalyptic number.

It is an amenable number.

144564993 is a deficient number, since it is larger than the sum of its proper divisors (71390241).

144564993 is an equidigital number, since it uses as much as digits as its factorization.

144564993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1784765 (or 1784756 counting only the distinct ones).

The product of its digits is 466560, while the sum is 45.

The square root of 144564993 is about 12023.5183286757. The cubic root of 144564993 is about 524.8328937549.

The spelling of 144564993 in words is "one hundred forty-four million, five hundred sixty-four thousand, nine hundred ninety-three".