509914809689 has 2 divisors, whose sum is σ = 509914809690. Its totient is φ = 509914809688.

The previous prime is 509914809641. The next prime is 509914809757. The reversal of 509914809689 is 986908419905.

It is an a-pointer prime, because the next prime (509914809757) can be obtained adding 509914809689 to its sum of digits (68).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 316563769600 + 193351040089 = 562640^2 + 439717^2 .

It is a cyclic number.

It is not a de Polignac number, because 509914809689 - 2³² = 505619842393 is a prime.

It is a super-2 number, since 2×509914809689² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (509914809589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254957404844 + 254957404845.

It is an arithmetic number, because the mean of its divisors is an integer number (254957404845).

Almost surely, 2^509914809689 is an apocalyptic number.

It is an amenable number.

509914809689 is a deficient number, since it is larger than the sum of its proper divisors (1).

509914809689 is an equidigital number, since it uses as much as digits as its factorization.

509914809689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50388480, while the sum is 68.

The spelling of 509914809689 in words is "five hundred nine billion, nine hundred fourteen million, eight hundred nine thousand, six hundred eighty-nine".