12412515509 has 4 divisors (see below), whose sum is σ = 12412791180. Its totient is φ = 12412239840.

The previous prime is 12412515499. The next prime is 12412515517. The reversal of 12412515509 is 90551521421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90551521421 = 197 ⋅459652393.

It can be written as a sum of positive squares in 2 ways, for example, as 10002000100 + 2410515409 = 100010^2 + 49097^2 .

It is a cyclic number.

It is not a de Polignac number, because 12412515509 - 2¹² = 12412511413 is a prime.

It is a super-2 number, since 2×12412515509² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12412515539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52814 + ... + 166175.

It is an arithmetic number, because the mean of its divisors is an integer number (3103197795).

Almost surely, 2^12412515509 is an apocalyptic number.

It is an amenable number.

12412515509 is a deficient number, since it is larger than the sum of its proper divisors (275671).

12412515509 is an equidigital number, since it uses as much as digits as its factorization.

12412515509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275670.

The product of its (nonzero) digits is 18000, while the sum is 35.

The spelling of 12412515509 in words is "twelve billion, four hundred twelve million, five hundred fifteen thousand, five hundred nine".