509129669 has 2 divisors, whose sum is σ = 509129670. Its totient is φ = 509129668.

The previous prime is 509129639. The next prime is 509129671. The reversal of 509129669 is 966921905.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 506025025 + 3104644 = 22495^2 + 1762^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-509129669 is a prime.

It is a super-2 number, since 2×509129669² = 518426039712099122, which contains 22 as substring.

Together with 509129671, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (509129609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254564834 + 254564835.

It is an arithmetic number, because the mean of its divisors is an integer number (254564835).

Almost surely, 2^509129669 is an apocalyptic number.

It is an amenable number.

509129669 is a deficient number, since it is larger than the sum of its proper divisors (1).

509129669 is an equidigital number, since it uses as much as digits as its factorization.

509129669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 262440, while the sum is 47.

The square root of 509129669 is about 22563.9019010454. The cubic root of 509129669 is about 798.5022335571.

The spelling of 509129669 in words is "five hundred nine million, one hundred twenty-nine thousand, six hundred sixty-nine".