144889981 has 2 divisors, whose sum is σ = 144889982. Its totient is φ = 144889980.

The previous prime is 144889961. The next prime is 144889993. The reversal of 144889981 is 189988441.

144889981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 93896100 + 50993881 = 9690^2 + 7141^2 .

It is a cyclic number.

It is not a de Polignac number, because 144889981 - 2²¹ = 142792829 is a prime.

It is a super-2 number, since 2×144889981² = 41986213188360722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (144889961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72444990 + 72444991.

It is an arithmetic number, because the mean of its divisors is an integer number (72444991).

Almost surely, 2^144889981 is an apocalyptic number.

It is an amenable number.

144889981 is a deficient number, since it is larger than the sum of its proper divisors (1).

144889981 is an equidigital number, since it uses as much as digits as its factorization.

144889981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 663552, while the sum is 52.

The square root of 144889981 is about 12037.0254215898. The cubic root of 144889981 is about 525.2258813342.

The spelling of 144889981 in words is "one hundred forty-four million, eight hundred eighty-nine thousand, nine hundred eighty-one".