12515001281 has 4 divisors (see below), whose sum is σ = 12781277952. Its totient is φ = 12248724612.

The previous prime is 12515001269. The next prime is 12515001319. The reversal of 12515001281 is 18210051521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12515001281 - 2²² = 12510806977 is a prime.

It is a super-2 number, since 2×12515001281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12515001281.

It is not an unprimeable number, because it can be changed into a prime (12515001241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133138265 + ... + 133138358.

It is an arithmetic number, because the mean of its divisors is an integer number (3195319488).

Almost surely, 2^12515001281 is an apocalyptic number.

It is an amenable number.

12515001281 is a deficient number, since it is larger than the sum of its proper divisors (266276671).

12515001281 is an equidigital number, since it uses as much as digits as its factorization.

12515001281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266276670.

The product of its (nonzero) digits is 800, while the sum is 26.

The spelling of 12515001281 in words is "twelve billion, five hundred fifteen million, one thousand, two hundred eighty-one".