144642281 has 4 divisors (see below), whose sum is σ = 165305472. Its totient is φ = 123979092.

The previous prime is 144642263. The next prime is 144642283. The reversal of 144642281 is 182246441.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-144642281 is a prime.

It is a super-2 number, since 2×144642281² = 41842778905765922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (144642283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10331585 + ... + 10331598.

It is an arithmetic number, because the mean of its divisors is an integer number (41326368).

Almost surely, 2^144642281 is an apocalyptic number.

It is an amenable number.

144642281 is a deficient number, since it is larger than the sum of its proper divisors (20663191).

144642281 is an equidigital number, since it uses as much as digits as its factorization.

144642281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20663190.

The product of its digits is 12288, while the sum is 32.

The square root of 144642281 is about 12026.7319334888. The cubic root of 144642281 is about 524.9264066155.

The spelling of 144642281 in words is "one hundred forty-four million, six hundred forty-two thousand, two hundred eighty-one".