12901512581 has 4 divisors (see below), whose sum is σ = 12902840064. Its totient is φ = 12900185100.

The previous prime is 12901512571. The next prime is 12901512587. The reversal of 12901512581 is 18521510921.

12901512581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18521510921 = 71 ⋅260866351.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12901512581 is a prime.

It is a super-2 number, since 2×12901512581² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12901512587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 649055 + ... + 668636.

It is an arithmetic number, because the mean of its divisors is an integer number (3225710016).

Almost surely, 2^12901512581 is an apocalyptic number.

It is an amenable number.

12901512581 is a deficient number, since it is larger than the sum of its proper divisors (1327483).

12901512581 is an equidigital number, since it uses as much as digits as its factorization.

12901512581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327482.

The product of its (nonzero) digits is 7200, while the sum is 35.

The spelling of 12901512581 in words is "twelve billion, nine hundred one million, five hundred twelve thousand, five hundred eighty-one".