144924781 has 2 divisors, whose sum is σ = 144924782. Its totient is φ = 144924780.

The previous prime is 144924763. The next prime is 144924797. The reversal of 144924781 is 187429441.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131308681 + 13616100 = 11459^2 + 3690^2 .

It is a cyclic number.

It is not a de Polignac number, because 144924781 - 2¹¹ = 144922733 is a prime.

It is a super-2 number, since 2×144924781² = 42006384295795922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (144924751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72462390 + 72462391.

It is an arithmetic number, because the mean of its divisors is an integer number (72462391).

Almost surely, 2^144924781 is an apocalyptic number.

It is an amenable number.

144924781 is a deficient number, since it is larger than the sum of its proper divisors (1).

144924781 is an equidigital number, since it uses as much as digits as its factorization.

144924781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 40.

The square root of 144924781 is about 12038.4708746585. The cubic root of 144924781 is about 525.2679279441.

The spelling of 144924781 in words is "one hundred forty-four million, nine hundred twenty-four thousand, seven hundred eighty-one".