145662509 has 2 divisors, whose sum is σ = 145662510. Its totient is φ = 145662508.

The previous prime is 145662469. The next prime is 145662527. The reversal of 145662509 is 905266541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97081609 + 48580900 = 9853^2 + 6970^2 .

It is a cyclic number.

It is not a de Polignac number, because 145662509 - 2¹² = 145658413 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145662529) 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, 72831254 + 72831255.

It is an arithmetic number, because the mean of its divisors is an integer number (72831255).

Almost surely, 2^145662509 is an apocalyptic number.

It is an amenable number.

145662509 is a deficient number, since it is larger than the sum of its proper divisors (1).

145662509 is an equidigital number, since it uses as much as digits as its factorization.

145662509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 145662509 is about 12069.0724167187. The cubic root of 145662509 is about 526.1576979973.

The spelling of 145662509 in words is "one hundred forty-five million, six hundred sixty-two thousand, five hundred nine".