145505509 has 2 divisors, whose sum is σ = 145505510. Its totient is φ = 145505508.

The previous prime is 145505501. The next prime is 145505513. The reversal of 145505509 is 905505541.

145505509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119464900 + 26040609 = 10930^2 + 5103^2 .

It is a cyclic number.

It is not a de Polignac number, because 145505509 - 2³ = 145505501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145505501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72752754 + 72752755.

It is an arithmetic number, because the mean of its divisors is an integer number (72752755).

Almost surely, 2^145505509 is an apocalyptic number.

It is an amenable number.

145505509 is a deficient number, since it is larger than the sum of its proper divisors (1).

145505509 is an equidigital number, since it uses as much as digits as its factorization.

145505509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22500, while the sum is 34.

The square root of 145505509 is about 12062.5664350502. The cubic root of 145505509 is about 525.9685931601.

The spelling of 145505509 in words is "one hundred forty-five million, five hundred five thousand, five hundred nine".