144531209 has 2 divisors, whose sum is σ = 144531210. Its totient is φ = 144531208.

The previous prime is 144531199. The next prime is 144531239. The reversal of 144531209 is 902135441.

144531209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127125625 + 17405584 = 11275^2 + 4172^2 .

It is a cyclic number.

It is not a de Polignac number, because 144531209 - 2²⁴ = 127753993 is a prime.

It is not a weakly prime, because it can be changed into another prime (144531239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72265604 + 72265605.

It is an arithmetic number, because the mean of its divisors is an integer number (72265605).

Almost surely, 2^144531209 is an apocalyptic number.

It is an amenable number.

144531209 is a deficient number, since it is larger than the sum of its proper divisors (1).

144531209 is an equidigital number, since it uses as much as digits as its factorization.

144531209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 144531209 is about 12022.1133333537. The cubic root of 144531209 is about 524.7920071025.

The spelling of 144531209 in words is "one hundred forty-four million, five hundred thirty-one thousand, two hundred nine".