144020981 has 8 divisors (see below), whose sum is σ = 158026680. Its totient is φ = 130433472.

The previous prime is 144020971. The next prime is 144021011. The reversal of 144020981 is 189020441.

It can be written as a sum of positive squares in 4 ways, for example, as 5134756 + 138886225 = 2266^2 + 11785^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 144020981 - 2¹⁰ = 144019957 is a prime.

It is a super-2 number, since 2×144020981² = 41484085936404722, 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 (144020911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103826 + ... + 105203.

It is an arithmetic number, because the mean of its divisors is an integer number (19753335).

Almost surely, 2^144020981 is an apocalyptic number.

It is an amenable number.

144020981 is a deficient number, since it is larger than the sum of its proper divisors (14005699).

144020981 is a wasteful number, since it uses less digits than its factorization.

144020981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209095.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 144020981 is about 12000.8741764923. The cubic root of 144020981 is about 524.1737339829.

The spelling of 144020981 in words is "one hundred forty-four million, twenty thousand, nine hundred eighty-one".