13540022009 has 4 divisors (see below), whose sum is σ = 13543370100. Its totient is φ = 13536673920.

The previous prime is 13540021991. The next prime is 13540022021. The reversal of 13540022009 is 90022004531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90022004531 = 23 ⋅3914000197.

It can be written as a sum of positive squares in 2 ways, for example, as 5584273984 + 7955748025 = 74728^2 + 89195^2 .

It is a cyclic number.

It is not a de Polignac number, because 13540022009 - 2¹⁶ = 13539956473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13540022039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1667972 + ... + 1676069.

It is an arithmetic number, because the mean of its divisors is an integer number (3385842525).

Almost surely, 2^13540022009 is an apocalyptic number.

It is an amenable number.

13540022009 is a deficient number, since it is larger than the sum of its proper divisors (3348091).

13540022009 is an equidigital number, since it uses as much as digits as its factorization.

13540022009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3348090.

The product of its (nonzero) digits is 2160, while the sum is 26.

The spelling of 13540022009 in words is "thirteen billion, five hundred forty million, twenty-two thousand, nine".