144540569981 has 2 divisors, whose sum is σ = 144540569982. Its totient is φ = 144540569980.

The previous prime is 144540569947. The next prime is 144540570029. The reversal of 144540569981 is 189965045441.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77358521956 + 67182048025 = 278134^2 + 259195^2 .

It is an emirp because it is prime and its reverse (189965045441) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-144540569981 is a prime.

It is a super-2 number, since 2×144540569981² (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 (144540169981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72270284990 + 72270284991.

It is an arithmetic number, because the mean of its divisors is an integer number (72270284991).

Almost surely, 2^144540569981 is an apocalyptic number.

It is an amenable number.

144540569981 is a deficient number, since it is larger than the sum of its proper divisors (1).

144540569981 is an equidigital number, since it uses as much as digits as its factorization.

144540569981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6220800, while the sum is 56.

The spelling of 144540569981 in words is "one hundred forty-four billion, five hundred forty million, five hundred sixty-nine thousand, nine hundred eighty-one".