13246579981 has 2 divisors, whose sum is σ = 13246579982. Its totient is φ = 13246579980.

The previous prime is 13246579943. The next prime is 13246579993. The reversal of 13246579981 is 18997564231.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7202916900 + 6043663081 = 84870^2 + 77741^2 .

It is an emirp because it is prime and its reverse (18997564231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13246579981 - 2²⁹ = 12709709069 is a prime.

It is a super-2 number, since 2×13246579981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13246579481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6623289990 + 6623289991.

It is an arithmetic number, because the mean of its divisors is an integer number (6623289991).

Almost surely, 2^13246579981 is an apocalyptic number.

It is an amenable number.

13246579981 is a deficient number, since it is larger than the sum of its proper divisors (1).

13246579981 is an equidigital number, since it uses as much as digits as its factorization.

13246579981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 55.

The spelling of 13246579981 in words is "thirteen billion, two hundred forty-six million, five hundred seventy-nine thousand, nine hundred eighty-one".