144640549 has 2 divisors, whose sum is σ = 144640550. Its totient is φ = 144640548.

The previous prime is 144640523. The next prime is 144640609. The reversal of 144640549 is 945046441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142444225 + 2196324 = 11935^2 + 1482^2 .

It is an emirp because it is prime and its reverse (945046441) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 144640549 - 2⁷ = 144640421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (144640849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72320274 + 72320275.

It is an arithmetic number, because the mean of its divisors is an integer number (72320275).

Almost surely, 2^144640549 is an apocalyptic number.

It is an amenable number.

144640549 is a deficient number, since it is larger than the sum of its proper divisors (1).

144640549 is an equidigital number, since it uses as much as digits as its factorization.

144640549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 144640549 is about 12026.6599270122. The cubic root of 144640549 is about 524.9243113864.

The spelling of 144640549 in words is "one hundred forty-four million, six hundred forty thousand, five hundred forty-nine".