12130001981 has 2 divisors, whose sum is σ = 12130001982. Its totient is φ = 12130001980.

The previous prime is 12130001911. The next prime is 12130002013. The reversal of 12130001981 is 18910003121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7870351225 + 4259650756 = 88715^2 + 65266^2 .

It is an emirp because it is prime and its reverse (18910003121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12130001981 - 2²² = 12125807677 is a prime.

It is a super-2 number, since 2×12130001981² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12130001981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12130001911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6065000990 + 6065000991.

It is an arithmetic number, because the mean of its divisors is an integer number (6065000991).

Almost surely, 2^12130001981 is an apocalyptic number.

It is an amenable number.

12130001981 is a deficient number, since it is larger than the sum of its proper divisors (1).

12130001981 is an equidigital number, since it uses as much as digits as its factorization.

12130001981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 26.

The spelling of 12130001981 in words is "twelve billion, one hundred thirty million, one thousand, nine hundred eighty-one".