144665813 has 2 divisors, whose sum is σ = 144665814. Its totient is φ = 144665812.

The previous prime is 144665771. The next prime is 144665821. The reversal of 144665813 is 318566441.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105001009 + 39664804 = 10247^2 + 6298^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-144665813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (144665863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72332906 + 72332907.

It is an arithmetic number, because the mean of its divisors is an integer number (72332907).

Almost surely, 2^144665813 is an apocalyptic number.

It is an amenable number.

144665813 is a deficient number, since it is larger than the sum of its proper divisors (1).

144665813 is an equidigital number, since it uses as much as digits as its factorization.

144665813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 38.

The square root of 144665813 is about 12027.7102143342. The cubic root of 144665813 is about 524.9548720091.

The spelling of 144665813 in words is "one hundred forty-four million, six hundred sixty-five thousand, eight hundred thirteen".