144789785981 has 2 divisors, whose sum is σ = 144789785982. Its totient is φ = 144789785980.

The previous prime is 144789785977. The next prime is 144789786017. The reversal of 144789785981 is 189587987441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115331556025 + 29458229956 = 339605^2 + 171634^2 .

It is a cyclic number.

It is not a de Polignac number, because 144789785981 - 2² = 144789785977 is a prime.

It is a super-2 number, since 2×144789785981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (144789785941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72394892990 + 72394892991.

It is an arithmetic number, because the mean of its divisors is an integer number (72394892991).

Almost surely, 2^144789785981 is an apocalyptic number.

It is an amenable number.

144789785981 is a deficient number, since it is larger than the sum of its proper divisors (1).

144789785981 is an equidigital number, since it uses as much as digits as its factorization.

144789785981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162570240, while the sum is 71.

The spelling of 144789785981 in words is "one hundred forty-four billion, seven hundred eighty-nine million, seven hundred eighty-five thousand, nine hundred eighty-one".