144337981 has 4 divisors (see below), whose sum is σ = 144719200. Its totient is φ = 143956764.

The previous prime is 144337957. The next prime is 144337993. The reversal of 144337981 is 189733441.

144337981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 189733441 = 113 ⋅1679057.

It is a cyclic number.

It is not a de Polignac number, because 144337981 - 2⁹ = 144337469 is a prime.

It is a super-2 number, since 2×144337981² = 41666905518312722, 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 (144337931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190041 + ... + 190798.

It is an arithmetic number, because the mean of its divisors is an integer number (36179800).

Almost surely, 2^144337981 is an apocalyptic number.

It is an amenable number.

144337981 is a deficient number, since it is larger than the sum of its proper divisors (381219).

144337981 is an equidigital number, since it uses as much as digits as its factorization.

144337981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381218.

The product of its digits is 72576, while the sum is 40.

The square root of 144337981 is about 12014.0742881006. The cubic root of 144337981 is about 524.5580328753.

The spelling of 144337981 in words is "one hundred forty-four million, three hundred thirty-seven thousand, nine hundred eighty-one".