509691233 has 2 divisors, whose sum is σ = 509691234. Its totient is φ = 509691232.

The previous prime is 509691227. The next prime is 509691241. The reversal of 509691233 is 332196905.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 493595089 + 16096144 = 22217^2 + 4012^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-509691233 is a prime.

It is not a weakly prime, because it can be changed into another prime (509699233) 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, 254845616 + 254845617.

It is an arithmetic number, because the mean of its divisors is an integer number (254845617).

Almost surely, 2^509691233 is an apocalyptic number.

It is an amenable number.

509691233 is a deficient number, since it is larger than the sum of its proper divisors (1).

509691233 is an equidigital number, since it uses as much as digits as its factorization.

509691233 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43740, while the sum is 38.

The square root of 509691233 is about 22576.3423299701. The cubic root of 509691233 is about 798.7957051897.

The spelling of 509691233 in words is "five hundred nine million, six hundred ninety-one thousand, two hundred thirty-three".