144540521 has 2 divisors, whose sum is σ = 144540522. Its totient is φ = 144540520.

The previous prime is 144540503. The next prime is 144540523. The reversal of 144540521 is 125045441.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113124496 + 31416025 = 10636^2 + 5605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-144540521 is a prime.

Together with 144540523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (144540523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72270260 + 72270261.

It is an arithmetic number, because the mean of its divisors is an integer number (72270261).

Almost surely, 2^144540521 is an apocalyptic number.

It is an amenable number.

144540521 is a deficient number, since it is larger than the sum of its proper divisors (1).

144540521 is an equidigital number, since it uses as much as digits as its factorization.

144540521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 144540521 is about 12022.5006134331. The cubic root of 144540521 is about 524.8032774670.

Adding to 144540521 its reverse (125045441), we get a palindrome (269585962).

The spelling of 144540521 in words is "one hundred forty-four million, five hundred forty thousand, five hundred twenty-one".