12012312581 has 2 divisors, whose sum is σ = 12012312582. Its totient is φ = 12012312580.

The previous prime is 12012312539. The next prime is 12012312673. The reversal of 12012312581 is 18521321021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8711235556 + 3301077025 = 93334^2 + 57455^2 .

It is a cyclic number.

It is not a de Polignac number, because 12012312581 - 2²⁶ = 11945203717 is a prime.

It is a super-3 number, since 3×12012312581³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 12012312581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12012312181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6006156290 + 6006156291.

It is an arithmetic number, because the mean of its divisors is an integer number (6006156291).

Almost surely, 2^12012312581 is an apocalyptic number.

It is an amenable number.

12012312581 is a deficient number, since it is larger than the sum of its proper divisors (1).

12012312581 is an equidigital number, since it uses as much as digits as its factorization.

12012312581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 26.

The spelling of 12012312581 in words is "twelve billion, twelve million, three hundred twelve thousand, five hundred eighty-one".