145650809 has 2 divisors, whose sum is σ = 145650810. Its totient is φ = 145650808.

The previous prime is 145650767. The next prime is 145650811. The reversal of 145650809 is 908056541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137827600 + 7823209 = 11740^2 + 2797^2 .

It is a cyclic number.

It is not a de Polignac number, because 145650809 - 2¹² = 145646713 is a prime.

Together with 145650811, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (145650829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72825404 + 72825405.

It is an arithmetic number, because the mean of its divisors is an integer number (72825405).

Almost surely, 2^145650809 is an apocalyptic number.

It is an amenable number.

145650809 is a deficient number, since it is larger than the sum of its proper divisors (1).

145650809 is an equidigital number, since it uses as much as digits as its factorization.

145650809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 145650809 is about 12068.5876969926. The cubic root of 145650809 is about 526.1436101584.

The spelling of 145650809 in words is "one hundred forty-five million, six hundred fifty thousand, eight hundred nine".