502505012509 has 2 divisors, whose sum is σ = 502505012510. Its totient is φ = 502505012508.

The previous prime is 502505012501. The next prime is 502505012563. The reversal of 502505012509 is 905210505205.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 261893180025 + 240611832484 = 511755^2 + 490522^2 .

It is a cyclic number.

It is not a de Polignac number, because 502505012509 - 2³ = 502505012501 is a prime.

It is a super-2 number, since 2×502505012509² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (502505012501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 251252506254 + 251252506255.

It is an arithmetic number, because the mean of its divisors is an integer number (251252506255).

Almost surely, 2^502505012509 is an apocalyptic number.

It is an amenable number.

502505012509 is a deficient number, since it is larger than the sum of its proper divisors (1).

502505012509 is an equidigital number, since it uses as much as digits as its factorization.

502505012509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22500, while the sum is 34.

The spelling of 502505012509 in words is "five hundred two billion, five hundred five million, twelve thousand, five hundred nine".