145503209 has 2 divisors, whose sum is σ = 145503210. Its totient is φ = 145503208.

The previous prime is 145503199. The next prime is 145503217. The reversal of 145503209 is 902305541.

145503209 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., 130074025 + 15429184 = 11405^2 + 3928^2 .

It is an emirp because it is prime and its reverse (902305541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145503209 - 2⁸ = 145502953 is a prime.

It is not a weakly prime, because it can be changed into another prime (145503269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72751604 + 72751605.

It is an arithmetic number, because the mean of its divisors is an integer number (72751605).

Almost surely, 2^145503209 is an apocalyptic number.

It is an amenable number.

145503209 is a deficient number, since it is larger than the sum of its proper divisors (1).

145503209 is an equidigital number, since it uses as much as digits as its factorization.

145503209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 145503209 is about 12062.4710984110. The cubic root of 145503209 is about 525.9658218237.

The spelling of 145503209 in words is "one hundred forty-five million, five hundred three thousand, two hundred nine".