13450526581 has 2 divisors, whose sum is σ = 13450526582. Its totient is φ = 13450526580.

The previous prime is 13450526539. The next prime is 13450526587. The reversal of 13450526581 is 18562505431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12402385956 + 1048140625 = 111366^2 + 32375^2 .

It is an emirp because it is prime and its reverse (18562505431) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13450526581 - 2⁹ = 13450526069 is a prime.

It is a super-2 number, since 2×13450526581² (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 (13450526587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6725263290 + 6725263291.

It is an arithmetic number, because the mean of its divisors is an integer number (6725263291).

Almost surely, 2^13450526581 is an apocalyptic number.

It is an amenable number.

13450526581 is a deficient number, since it is larger than the sum of its proper divisors (1).

13450526581 is an equidigital number, since it uses as much as digits as its factorization.

13450526581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144000, while the sum is 40.

The spelling of 13450526581 in words is "thirteen billion, four hundred fifty million, five hundred twenty-six thousand, five hundred eighty-one".