144442981 has 4 divisors (see below), whose sum is σ = 149102464. Its totient is φ = 139783500.

The previous prime is 144442979. The next prime is 144443009. The reversal of 144442981 is 189244441.

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: 189244441 = 2579 ⋅73379.

It is a cyclic number.

It is not a de Polignac number, because 144442981 - 2¹ = 144442979 is a prime.

It is a super-2 number, since 2×144442981² = 41727549520332722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 144442981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (144442901) 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 3 ways as a sum of consecutive naturals, for example, 2329695 + ... + 2329756.

It is an arithmetic number, because the mean of its divisors is an integer number (37275616).

Almost surely, 2^144442981 is an apocalyptic number.

It is an amenable number.

144442981 is a deficient number, since it is larger than the sum of its proper divisors (4659483).

144442981 is an equidigital number, since it uses as much as digits as its factorization.

144442981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4659482.

The product of its digits is 36864, while the sum is 37.

The square root of 144442981 is about 12018.4433684234. The cubic root of 144442981 is about 524.6852002424.

The spelling of 144442981 in words is "one hundred forty-four million, four hundred forty-two thousand, nine hundred eighty-one".