144563561 has 2 divisors, whose sum is σ = 144563562. Its totient is φ = 144563560.

The previous prime is 144563519. The next prime is 144563567. The reversal of 144563561 is 165365441.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126450025 + 18113536 = 11245^2 + 4256^2 .

It is an emirp because it is prime and its reverse (165365441) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-144563561 is a prime.

It is not a weakly prime, because it can be changed into another prime (144563567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72281780 + 72281781.

It is an arithmetic number, because the mean of its divisors is an integer number (72281781).

Almost surely, 2^144563561 is an apocalyptic number.

It is an amenable number.

144563561 is a deficient number, since it is larger than the sum of its proper divisors (1).

144563561 is an equidigital number, since it uses as much as digits as its factorization.

144563561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 35.

The square root of 144563561 is about 12023.4587785712. The cubic root of 144563561 is about 524.8311608246.

The spelling of 144563561 in words is "one hundred forty-four million, five hundred sixty-three thousand, five hundred sixty-one".