145733909 has 2 divisors, whose sum is σ = 145733910. Its totient is φ = 145733908.

The previous prime is 145733881. The next prime is 145733921. The reversal of 145733909 is 909337541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106708900 + 39025009 = 10330^2 + 6247^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145733909 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145733969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72866954 + 72866955.

It is an arithmetic number, because the mean of its divisors is an integer number (72866955).

Almost surely, 2^145733909 is an apocalyptic number.

It is an amenable number.

145733909 is a deficient number, since it is larger than the sum of its proper divisors (1).

145733909 is an equidigital number, since it uses as much as digits as its factorization.

145733909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 102060, while the sum is 41.

The square root of 145733909 is about 12072.0300281270. The cubic root of 145733909 is about 526.2436535928.

The spelling of 145733909 in words is "one hundred forty-five million, seven hundred thirty-three thousand, nine hundred nine".