145134809 has 2 divisors, whose sum is σ = 145134810. Its totient is φ = 145134808.

The previous prime is 145134767. The next prime is 145134817. The reversal of 145134809 is 908431541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131790400 + 13344409 = 11480^2 + 3653^2 .

It is an emirp because it is prime and its reverse (908431541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145134809 - 2⁸ = 145134553 is a prime.

It is a super-2 number, since 2×145134809² = 42128225566932962, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (145131809) 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, 72567404 + 72567405.

It is an arithmetic number, because the mean of its divisors is an integer number (72567405).

Almost surely, 2^145134809 is an apocalyptic number.

It is an amenable number.

145134809 is a deficient number, since it is larger than the sum of its proper divisors (1).

145134809 is an equidigital number, since it uses as much as digits as its factorization.

145134809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 145134809 is about 12047.1909173882. The cubic root of 145134809 is about 525.5215485265.

The spelling of 145134809 in words is "one hundred forty-five million, one hundred thirty-four thousand, eight hundred nine".